diff --git a/MatrixSDK/Background/Store/MXSyncResponseStoreManager.swift b/MatrixSDK/Background/Store/MXSyncResponseStoreManager.swift
index 04dca45995..fb7f8334f9 100644
--- a/MatrixSDK/Background/Store/MXSyncResponseStoreManager.swift
+++ b/MatrixSDK/Background/Store/MXSyncResponseStoreManager.swift
@@ -327,18 +327,18 @@ public class MXSyncResponseStoreManager: NSObject {
         for event in eventsToProcess {
             switch event.eventType {
                 case .roomAliases:
-                    if summary.displayname == nil {
-                        summary.displayname = (event.content["aliases"] as? [String])?.first
+                    if summary.displayName == nil {
+                        summary.displayName = (event.content["aliases"] as? [String])?.first
                     }
                 case .roomCanonicalAlias:
-                    if summary.displayname == nil {
-                        summary.displayname = event.content["alias"] as? String
-                        if summary.displayname == nil {
-                            summary.displayname = (event.content["alt_aliases"] as? [String])?.first
+                    if summary.displayName == nil {
+                        summary.displayName = event.content["alias"] as? String
+                        if summary.displayName == nil {
+                            summary.displayName = (event.content["alt_aliases"] as? [String])?.first
                         }
                     }
                 case .roomName:
-                    summary.displayname = event.content["name"] as? String
+                    summary.displayName = event.content["name"] as? String
                 default:
                     break
             }
diff --git a/MatrixSDK/Data/MXRoom.m b/MatrixSDK/Data/MXRoom.m
index e4ae043eab..020af712d3 100644
--- a/MatrixSDK/Data/MXRoom.m
+++ b/MatrixSDK/Data/MXRoom.m
@@ -3870,7 +3870,7 @@ - (void)membersTrustLevelSummaryWithForceDownload:(BOOL)forceDownload success:(v
 
 - (NSString *)description
 {
-    return [NSString stringWithFormat:@"<MXRoom: %p> %@: %@ - %@", self, self.roomId, self.summary.displayname, self.summary.topic];
+    return [NSString stringWithFormat:@"<MXRoom: %p> %@: %@ - %@", self, self.roomId, self.summary.displayName, self.summary.topic];
 }
 
 - (NSComparisonResult)compareLastMessageEventOriginServerTs:(MXRoom *)otherRoom
diff --git a/MatrixSDK/Data/MXRoomSummary.h b/MatrixSDK/Data/MXRoomSummary.h
index 70437d7754..63147cd2dc 100644
--- a/MatrixSDK/Data/MXRoomSummary.h
+++ b/MatrixSDK/Data/MXRoomSummary.h
@@ -169,7 +169,7 @@ FOUNDATION_EXPORT NSUInteger const MXRoomSummaryPaginationChunkSize;
 /**
  The computed display name of the room.
  */
-@property (nonatomic) NSString *displayname;
+@property (nonatomic) NSString *displayName;
 
 /**
  The topic of the room.
diff --git a/MatrixSDK/Data/MXRoomSummary.m b/MatrixSDK/Data/MXRoomSummary.m
index d54d8623d0..0839f38085 100644
--- a/MatrixSDK/Data/MXRoomSummary.m
+++ b/MatrixSDK/Data/MXRoomSummary.m
@@ -243,7 +243,7 @@ - (void)updateWith:(id<MXRoomSummaryProtocol>)summary
     _roomTypeString = summary.roomTypeString;
     _roomType = summary.roomType;
     _avatar = summary.avatar;
-    _displayname = summary.displayname;
+    _displayName = summary.displayName;
     _topic = summary.topic;
     _creatorUserId = summary.creatorUserId;
     _aliases = summary.aliases;
@@ -286,7 +286,7 @@ - (void)resetRoomStateData
     MXRoom *room = self.room;
 
     _avatar = nil;
-    _displayname = nil;
+    _displayName = nil;
     _topic = nil;
     _aliases = nil;
 
@@ -296,7 +296,7 @@ - (void)resetRoomStateData
 
         BOOL updated = [self.mxSession.roomSummaryUpdateDelegate session:self.mxSession updateRoomSummary:self withStateEvents:roomState.stateEvents roomState:roomState];
 
-        if (self.displayname == nil || self.avatar == nil)
+        if (self.displayName == nil || self.avatar == nil)
         {
             // Avatar and displayname may not be recomputed from the state event list if
             // the latter does not contain any `name` or `avatar` event. So, in this case,
@@ -971,7 +971,7 @@ - (instancetype)initWithCoder:(NSCoder *)aDecoder
         _roomTypeString = [aDecoder decodeObjectForKey:@"roomTypeString"];
         _roomType = [aDecoder decodeIntegerForKey:@"roomType"];
         _avatar = [aDecoder decodeObjectForKey:@"avatar"];
-        _displayname = [aDecoder decodeObjectForKey:@"displayname"];
+        _displayName = [aDecoder decodeObjectForKey:@"displayname"];
         _topic = [aDecoder decodeObjectForKey:@"topic"];
         _creatorUserId = [aDecoder decodeObjectForKey:@"creatorUserId"];
         _aliases = [aDecoder decodeObjectForKey:@"aliases"];
@@ -1021,7 +1021,7 @@ - (void)encodeWithCoder:(NSCoder *)aCoder
     [aCoder encodeObject:_roomTypeString forKey:@"roomTypeString"];
     [aCoder encodeInteger:_roomType forKey:@"roomType"];
     [aCoder encodeObject:_avatar forKey:@"avatar"];
-    [aCoder encodeObject:_displayname forKey:@"displayname"];
+    [aCoder encodeObject:_displayName forKey:@"displayname"];
     [aCoder encodeObject:_topic forKey:@"topic"];
     [aCoder encodeObject:_creatorUserId forKey:@"creatorUserId"];    
     [aCoder encodeObject:_aliases forKey:@"aliases"];
@@ -1059,7 +1059,7 @@ - (void)encodeWithCoder:(NSCoder *)aCoder
 
 - (NSString *)description
 {
-    return [NSString stringWithFormat:@"%@ %@: %@ - %@", super.description, _roomId, _displayname, _lastMessage.eventId];
+    return [NSString stringWithFormat:@"%@ %@: %@ - %@", super.description, _roomId, _displayName, _lastMessage.eventId];
 }
 
 - (NSUInteger)hash
@@ -1070,7 +1070,7 @@ - (NSUInteger)hash
     result = prime * result + [_roomId hash];
     result = prime * result + [_roomTypeString hash];
     result = prime * result + [_avatar hash];
-    result = prime * result + [_displayname hash];
+    result = prime * result + [_displayName hash];
     result = prime * result + [_topic hash];
     result = prime * result + [_creatorUserId hash];
     result = prime * result + [_aliases hash];
diff --git a/MatrixSDK/Data/MXRoomSummaryProtocol.h b/MatrixSDK/Data/MXRoomSummaryProtocol.h
index 7c1cee6864..d5701f2c8d 100644
--- a/MatrixSDK/Data/MXRoomSummaryProtocol.h
+++ b/MatrixSDK/Data/MXRoomSummaryProtocol.h
@@ -48,7 +48,7 @@ NS_ASSUME_NONNULL_BEGIN
 @property (nonatomic, readonly) NSString * _Nullable avatar;
 
 /// The computed display name of the room.
-@property (nonatomic, readonly) NSString * _Nullable displayname;
+@property (nonatomic, readonly) NSString * _Nullable displayName;
 
 /// The topic of the room.
 @property (nonatomic, readonly) NSString * _Nullable topic;
diff --git a/MatrixSDK/Data/MXRoomSummaryUpdater.m b/MatrixSDK/Data/MXRoomSummaryUpdater.m
index 9e455fb198..f494abe568 100644
--- a/MatrixSDK/Data/MXRoomSummaryUpdater.m
+++ b/MatrixSDK/Data/MXRoomSummaryUpdater.m
@@ -153,7 +153,7 @@ - (BOOL)session:(MXSession *)session updateRoomSummary:(MXRoomSummary *)summary
         switch (event.eventType)
         {
             case MXEventTypeRoomName:
-                summary.displayname = roomState.name;
+                summary.displayName = roomState.name;
                 updated = YES;
                 break;
 
@@ -186,7 +186,7 @@ - (BOOL)session:(MXSession *)session updateRoomSummary:(MXRoomSummary *)summary
                 // If m.room.canonical_alias is set, use it if there is no m.room.name
                 if (!roomState.name && roomState.canonicalAlias)
                 {
-                    summary.displayname = roomState.canonicalAlias;
+                    summary.displayName = roomState.canonicalAlias;
                     updated = YES;
                 }
                 //  If canonicalAlias is set, add it to the aliases array
@@ -300,11 +300,11 @@ - (BOOL)session:(MXSession *)session updateRoomSummary:(MXRoomSummary *)summary
 
     NSUInteger memberCount = roomState.membersCount.members;
     if (memberCount > 1
-        && (!summary.displayname || [summary.displayname isEqualToString:_roomNameStringLocalizer.emptyRoom]))
+        && (!summary.displayName || [summary.displayName isEqualToString:_roomNameStringLocalizer.emptyRoom]))
     {
         // Data are missing to compute the display name
         MXLogDebug(@"[MXRoomSummaryUpdater] updateRoomSummary: Computed an unexpected \"Empty Room\" name. memberCount: %@", @(memberCount));
-        summary.displayname = [self fixUnexpectedEmptyRoomDisplayname:memberCount
+        summary.displayName = [self fixUnexpectedEmptyRoomDisplayname:memberCount
                                                               session:session
                                                             roomState:roomState];
         updated = YES;
@@ -524,9 +524,9 @@ - (BOOL)updateSummaryDisplayname:(MXRoomSummary *)summary session:(MXSession *)s
         }
     }
 
-    if (displayName != summary.displayname || ![displayName isEqualToString:summary.displayname])
+    if (displayName != summary.displayName || ![displayName isEqualToString:summary.displayName])
     {
-        summary.displayname = displayName;
+        summary.displayName = displayName;
         return YES;
     }
 
diff --git a/MatrixSDK/Data/RoomList/Common/MXBreadcrumbsRoomListDataFetcher.swift b/MatrixSDK/Data/RoomList/Common/MXBreadcrumbsRoomListDataFetcher.swift
index d4cd931ef5..507242e666 100644
--- a/MatrixSDK/Data/RoomList/Common/MXBreadcrumbsRoomListDataFetcher.swift
+++ b/MatrixSDK/Data/RoomList/Common/MXBreadcrumbsRoomListDataFetcher.swift
@@ -91,10 +91,10 @@ internal class MXBreadcrumbsRoomListDataFetcher: NSObject, MXRoomListDataFetcher
         
         if let query = fetchOptions.filterOptions.query?.lowercased(), !query.isEmpty {
             recentRoomIds = recentRoomIds.filter({ roomId in
-                guard let displayname = session?.roomSummary(withRoomId: roomId).displayname else {
+                guard let displayName = session?.roomSummary(withRoomId: roomId)?.displayName else {
                     return false
                 }
-                return displayname.lowercased().contains(query)
+                return displayName.lowercased().contains(query)
             })
         }
         
diff --git a/MatrixSDK/Data/RoomList/Common/MXRoomListDataFilterable.swift b/MatrixSDK/Data/RoomList/Common/MXRoomListDataFilterable.swift
index d5ea63d0bb..425f0c2d0a 100644
--- a/MatrixSDK/Data/RoomList/Common/MXRoomListDataFilterable.swift
+++ b/MatrixSDK/Data/RoomList/Common/MXRoomListDataFilterable.swift
@@ -122,7 +122,7 @@ extension MXRoomListDataFilterable {
         
         if let query = filterOptions.query, !query.isEmpty {
             let predicate1 = NSPredicate(format: "%K CONTAINS[cd] %@",
-                                         #keyPath(MXRoomSummaryProtocol.displayname),
+                                         #keyPath(MXRoomSummaryProtocol.displayName),
                                          query)
             let predicate2 = NSPredicate(format: "%K CONTAINS[cd] %@",
                                          #keyPath(MXRoomSummaryProtocol.spaceChildInfo.displayName),
diff --git a/MatrixSDK/Data/RoomList/Common/MXRoomListDataSortable.swift b/MatrixSDK/Data/RoomList/Common/MXRoomListDataSortable.swift
index 65a1f4a10b..2aced9df00 100644
--- a/MatrixSDK/Data/RoomList/Common/MXRoomListDataSortable.swift
+++ b/MatrixSDK/Data/RoomList/Common/MXRoomListDataSortable.swift
@@ -52,7 +52,7 @@ extension MXRoomListDataSortable {
 //        }
         
         if sortOptions.alphabetical {
-            result.append(NSSortDescriptor(keyPath: \MXRoomSummaryProtocol.displayname, ascending: true))
+            result.append(NSSortDescriptor(keyPath: \MXRoomSummaryProtocol.displayName, ascending: true))
         }
         
         if sortOptions.invitesFirst {
diff --git a/MatrixSDK/Data/RoomList/CoreData/MXCoreDataRoomListDataFetcher.swift b/MatrixSDK/Data/RoomList/CoreData/MXCoreDataRoomListDataFetcher.swift
index 0a3edf50ae..84c521bf96 100644
--- a/MatrixSDK/Data/RoomList/CoreData/MXCoreDataRoomListDataFetcher.swift
+++ b/MatrixSDK/Data/RoomList/CoreData/MXCoreDataRoomListDataFetcher.swift
@@ -410,7 +410,7 @@ private class RoomSummaryForTotalCounts: NSObject, MXRoomSummaryProtocol {
     var roomTypeString: String?
     var roomType: MXRoomType = .room
     var avatar: String?
-    var displayname: String?
+    var displayName: String?
     var topic: String?
     var creatorUserId: String = ""
     var aliases: [String] = []
@@ -465,7 +465,7 @@ private class RoomSummaryForTotalCounts: NSObject, MXRoomSummaryProtocol {
     }
 
     override var description: String {
-        return "<RoomSummaryForTotalCounts: \(roomId) \(String(describing: displayname))>"
+        return "<RoomSummaryForTotalCounts: \(roomId) \(String(describing: displayName))>"
     }
 
 }
diff --git a/MatrixSDK/Data/RoomSummaryStore/CoreData/Models/MXRoomSummaryMO.swift b/MatrixSDK/Data/RoomSummaryStore/CoreData/Models/MXRoomSummaryMO.swift
index c886d433a9..6c3730ecb9 100644
--- a/MatrixSDK/Data/RoomSummaryStore/CoreData/Models/MXRoomSummaryMO.swift
+++ b/MatrixSDK/Data/RoomSummaryStore/CoreData/Models/MXRoomSummaryMO.swift
@@ -83,7 +83,7 @@ public class MXRoomSummaryMO: NSManagedObject {
         s_typeString = summary.roomTypeString
         s_typeInt = Int16(summary.roomType.rawValue)
         s_avatar = summary.avatar
-        s_displayName = summary.displayname
+        s_displayName = summary.displayName
         s_topic = summary.topic
         s_creatorUserId = summary.creatorUserId
         s_aliases = summary.aliases.joined(separator: StringArrayDelimiter)
@@ -186,7 +186,7 @@ extension MXRoomSummaryMO: MXRoomSummaryProtocol {
         return s_avatar
     }
     
-    public var displayname: String? {
+    public var displayName: String? {
         return s_displayName
     }
     
diff --git a/MatrixSDK/MXSession.h b/MatrixSDK/MXSession.h
index c283598c8c..a9ce329a02 100644
--- a/MatrixSDK/MXSession.h
+++ b/MatrixSDK/MXSession.h
@@ -1087,7 +1087,7 @@ typedef void (^MXOnBackgroundSyncFail)(NSError *error);
 
  @return the MXRoomSummary instance.
  */
-- (MXRoomSummary *)roomSummaryWithRoomId:(NSString*)roomId;
+- (nullable MXRoomSummary *)roomSummaryWithRoomId:(NSString*)roomId;
 
 /**
  Recompute all room summaries last message.
diff --git a/MatrixSDK/MXSession.m b/MatrixSDK/MXSession.m
index 11d3370e3b..c32d663d84 100644
--- a/MatrixSDK/MXSession.m
+++ b/MatrixSDK/MXSession.m
@@ -3320,7 +3320,7 @@ - (MXHTTPOperation*)eventWithEventId:(NSString*)eventId
 
 
 #pragma mark - Rooms summaries
-- (MXRoomSummary *)roomSummaryWithRoomId:(NSString*)roomId
+- (nullable MXRoomSummary *)roomSummaryWithRoomId:(NSString*)roomId
 {
     MXRoomSummary *roomSummary;
 
diff --git a/MatrixSDK/Space/MXSpaceService.swift b/MatrixSDK/Space/MXSpaceService.swift
index 15011f7dc8..ad8b7b71bd 100644
--- a/MatrixSDK/Space/MXSpaceService.swift
+++ b/MatrixSDK/Space/MXSpaceService.swift
@@ -783,7 +783,7 @@ public class MXSpaceService: NSObject {
         membersCount.members = joinedMembersCount
         
         roomSummary.membersCount = membersCount
-        roomSummary.displayname = spaceChildSummaryResponse.name
+        roomSummary.displayName = spaceChildSummaryResponse.name
         roomSummary.topic = spaceChildSummaryResponse.topic
         roomSummary.avatar = spaceChildSummaryResponse.avatarUrl
         roomSummary.isEncrypted = false
diff --git a/MatrixSDK/VoIP/CallKit/MXCallKitAdapter.m b/MatrixSDK/VoIP/CallKit/MXCallKitAdapter.m
index a549f46bee..e4cfb2516c 100644
--- a/MatrixSDK/VoIP/CallKit/MXCallKitAdapter.m
+++ b/MatrixSDK/VoIP/CallKit/MXCallKitAdapter.m
@@ -401,7 +401,7 @@ - (void)contactIdentifierForCall:(MXCall *)call onComplete:(void (^)(NSString *c
 {
     if (call.isConferenceCall)
     {
-        onComplete(call.room.summary.displayname);
+        onComplete(call.room.summary.displayName);
     }
     else
     {
diff --git a/MatrixSDK/VoIP/MXCall.m b/MatrixSDK/VoIP/MXCall.m
index 227512f7b8..7affafe075 100644
--- a/MatrixSDK/VoIP/MXCall.m
+++ b/MatrixSDK/VoIP/MXCall.m
@@ -1117,7 +1117,7 @@ - (void)handleCallInvite:(MXEvent *)event
         }
         else
         {
-            _callerName = nativeRoom.summary.displayname;
+            _callerName = nativeRoom.summary.displayName;
         }
     }
     calleeId = callManager.mxSession.myUserId;
diff --git a/MatrixSDKTests/MXBackgroundSyncServiceTests.swift b/MatrixSDKTests/MXBackgroundSyncServiceTests.swift
index f64f9e57cb..736de954ab 100644
--- a/MatrixSDKTests/MXBackgroundSyncServiceTests.swift
+++ b/MatrixSDKTests/MXBackgroundSyncServiceTests.swift
@@ -391,7 +391,7 @@ class MXBackgroundSyncServiceTests: XCTestCase {
                                 case .success:
                                     let roomSummary = self.bgSyncService?.roomSummary(forRoomId: roomId)
                                     XCTAssertNotNil(roomSummary, "Room summary should be fetched")
-                                    XCTAssertEqual(roomSummary?.displayname, newName, "Room name change should be reflected")
+                                    XCTAssertEqual(roomSummary?.displayName, newName, "Room name change should be reflected")
                                     expectation?.fulfill()
                                 case .failure(let error):
                                     XCTFail("Cannot fetch the event from background sync service - error: \(error)")
diff --git a/MatrixSDKTests/MXCoreDataRoomListDataManagerUnitTests.swift b/MatrixSDKTests/MXCoreDataRoomListDataManagerUnitTests.swift
index fbe1ddc51e..ab883f92fc 100644
--- a/MatrixSDKTests/MXCoreDataRoomListDataManagerUnitTests.swift
+++ b/MatrixSDKTests/MXCoreDataRoomListDataManagerUnitTests.swift
@@ -214,7 +214,7 @@ class MXCoreDataRoomListDataManagerUnitTests: XCTestCase {
         
         //  rename rooms by index
         for (index, summary) in result.enumerated() {
-            summary.displayname = "Room \(index + 1)"
+            summary.displayName = "Room \(index + 1)"
             if let event = MXEvent(fromJSON: [
                 "event_id": MXTools.generateTransactionId() as Any,
                 "room_id": summary.roomId,
diff --git a/MatrixSDKTests/MXLazyLoadingTests.m b/MatrixSDKTests/MXLazyLoadingTests.m
index b8dffdc4ad..2bda1299b3 100644
--- a/MatrixSDKTests/MXLazyLoadingTests.m
+++ b/MatrixSDKTests/MXLazyLoadingTests.m
@@ -1041,8 +1041,8 @@ - (void)checkRoomSummaryDisplayNameFromHeroesWithLazyLoading:(BOOL)lazyLoading
 
             MXRoomSummary *roomSummary = [aliceSession roomSummaryWithRoomId:roomId];
 
-            XCTAssertTrue(roomSummary.displayname.length
-                              && ![roomSummary.displayname isEqualToString:@"Empty room"], @"Unexpected null room name: %@", roomSummary.displayname);
+            XCTAssertTrue(roomSummary.displayName.length
+                              && ![roomSummary.displayName isEqualToString:@"Empty room"], @"Unexpected null room name: %@", roomSummary.displayName);
 
             [expectation fulfill];
         }];
@@ -1079,8 +1079,8 @@ - (void)checkRoomSummaryDisplayNameWhenNoMoreNameWithLazyLoading:(BOOL)lazyLoadi
 
                 // -> The room name should be "Bob & 2 others"
                 MXRoomSummary *roomSummary = [aliceSession roomSummaryWithRoomId:roomId];
-                XCTAssertTrue(roomSummary.displayname.length
-                              && ![roomSummary.displayname isEqualToString:@"Empty room"], @"Unexpected null room name: %@", roomSummary.displayname);
+                XCTAssertTrue(roomSummary.displayName.length
+                              && ![roomSummary.displayName isEqualToString:@"Empty room"], @"Unexpected null room name: %@", roomSummary.displayName);
 
 
                  // Make alice do an initial sync
@@ -1100,8 +1100,8 @@ - (void)checkRoomSummaryDisplayNameWhenNoMoreNameWithLazyLoading:(BOOL)lazyLoadi
 
                         // -> The room name should be "Bob & 2 others"
                         MXRoomSummary *roomSummary2 = [aliceSession2 roomSummaryWithRoomId:roomId];
-                        XCTAssertTrue(roomSummary2.displayname.length
-                                      && ![roomSummary2.displayname isEqualToString:@"Empty room"], @"Unexpected null room name: %@", roomSummary2.displayname);
+                        XCTAssertTrue(roomSummary2.displayName.length
+                                      && ![roomSummary2.displayName isEqualToString:@"Empty room"], @"Unexpected null room name: %@", roomSummary2.displayName);
 
 
                         [expectation fulfill];
@@ -1145,10 +1145,10 @@ - (void)checkRoomSummaryDisplayNameInDirectChatWithLazyLoading:(BOOL)lazyLoading
     [self createDirectChatScenarioWithLazyLoading:lazyLoading readyToTest:^(MXSession *aliceSession, MXSession *bobSession, NSString *roomId, XCTestExpectation *expectation) {
 
         MXRoomSummary *roomSummary = [aliceSession roomSummaryWithRoomId:roomId];
-        XCTAssertTrue(roomSummary.displayname.length
-                      && ![roomSummary.displayname isEqualToString:@"Empty room"], @"Unexpected null room name: %@", roomSummary.displayname);
+        XCTAssertTrue(roomSummary.displayName.length
+                      && ![roomSummary.displayName isEqualToString:@"Empty room"], @"Unexpected null room name: %@", roomSummary.displayName);
 
-        NSString *roomDisplayName = roomSummary.displayname;
+        NSString *roomDisplayName = roomSummary.displayName;
 
         [aliceSession pause];
 
@@ -1160,7 +1160,7 @@ - (void)checkRoomSummaryDisplayNameInDirectChatWithLazyLoading:(BOOL)lazyLoading
 
                 // -> The room name should be still the same
                 MXRoomSummary *roomSummary2 = [aliceSession roomSummaryWithRoomId:roomId];
-                XCTAssertEqualObjects(roomSummary2.displayname, roomDisplayName);
+                XCTAssertEqualObjects(roomSummary2.displayName, roomDisplayName);
 
                 [expectation fulfill];
             }];
diff --git a/MatrixSDKTests/MXPeekingRoomTests.m b/MatrixSDKTests/MXPeekingRoomTests.m
index 66d8820f70..d9022d56ab 100644
--- a/MatrixSDKTests/MXPeekingRoomTests.m
+++ b/MatrixSDKTests/MXPeekingRoomTests.m
@@ -104,7 +104,7 @@ - (void)testPeekingSummary
 
                     XCTAssertNotNil(peekingRoom.summary);
 
-                    XCTAssertNotNil(peekingRoom.summary.displayname);
+                    XCTAssertNotNil(peekingRoom.summary.displayName);
                     XCTAssertNotNil(peekingRoom.summary.topic);
                     XCTAssertEqual(peekingRoom.summary.membersCount.members, 1, @"The MXPeekingRoom state must be known now");
 
diff --git a/MatrixSDKTests/MXRoomSummaryTests.m b/MatrixSDKTests/MXRoomSummaryTests.m
index 3b5f37a3aa..0644aa9e14 100644
--- a/MatrixSDKTests/MXRoomSummaryTests.m
+++ b/MatrixSDKTests/MXRoomSummaryTests.m
@@ -458,7 +458,7 @@ - (void)testDisplaynameUpdate
 
         observer = [[NSNotificationCenter defaultCenter] addObserverForName:kMXRoomSummaryDidChangeNotification object:summary queue:[NSOperationQueue mainQueue] usingBlock:^(NSNotification *note) {
 
-             XCTAssertEqualObjects(summary.displayname, displayName, @"Room summary must be updated");
+             XCTAssertEqualObjects(summary.displayName, displayName, @"Room summary must be updated");
 
              [expectation fulfill];
          }];
@@ -479,13 +479,13 @@ - (void)testRoomDisplaynameExcludingUsers
         
         [room state:^(MXRoomState *roomState) {
             // Given a room with two users.
-            XCTAssertEqualObjects(summary.displayname, @"mxAlice", @"A room with one other user should be given the name of that user.");
+            XCTAssertEqualObjects(summary.displayName, @"mxAlice", @"A room with one other user should be given the name of that user.");
             
             // When excluding the other user during a display name update.
             [updater updateSummaryDisplayname:summary session:bobSession withServerRoomSummary:nil roomState:roomState excludingUserIDs: @[aliceRestClient.credentials.userId]];
             
             // Then the name of the room should no longer include the other user.
-            XCTAssertEqualObjects(summary.displayname, @"Empty room", @"The name of the room should not include the other user when they are excluded.");
+            XCTAssertEqualObjects(summary.displayName, @"Empty room", @"The name of the room should not include the other user when they are excluded.");
             [expectation fulfill];
         }];
     }];
@@ -1107,7 +1107,7 @@ - (void)testStatePassedToMXRoomSummaryUpdating
             [room state:^(MXRoomState *roomState) {
 
                 XCTAssertEqualObjects(roomState.name, displayName);
-                XCTAssertEqualObjects(summary.displayname, displayName, @"Room summary must be updated");
+                XCTAssertEqualObjects(summary.displayName, displayName, @"Room summary must be updated");
 
                 [expectation fulfill];
             }];
diff --git a/MatrixSDKTests/MXSpaceServiceTest.swift b/MatrixSDKTests/MXSpaceServiceTest.swift
index 93a25d46bd..9921a002bf 100644
--- a/MatrixSDKTests/MXSpaceServiceTest.swift
+++ b/MatrixSDKTests/MXSpaceServiceTest.swift
@@ -196,7 +196,7 @@ class MXSpaceServiceTest: XCTestCase {
                         
                         XCTAssertTrue(summary.roomType == .space)
                         XCTAssert(summary.membersCount.members == 1, "Bob must be the only one")
-                        XCTAssertTrue(summary.displayname == expectedSpaceName)
+                        XCTAssertTrue(summary.displayName == expectedSpaceName)
                         XCTAssertTrue(summary.topic == expectedSpaceTopic)
                                             
                         guard let room = space.room else {
@@ -381,18 +381,18 @@ class MXSpaceServiceTest: XCTestCase {
                             switch response {
                             case .success(let spaceChildrenSummary):
 
-                                XCTAssert(spaceChildrenSummary.spaceInfo?.displayName == spaceB.summary?.displayname)
+                                XCTAssert(spaceChildrenSummary.spaceInfo?.displayName == spaceB.summary?.displayName)
 
                                 let childInfos = spaceChildrenSummary.childInfos
 
                                 XCTAssert(childInfos.count == 2)
 
                                 let childInfoSpaceC = childInfos.first { (childInfo) -> Bool in
-                                    childInfo.name == spaceC.summary?.displayname
+                                    childInfo.name == spaceC.summary?.displayName
                                 }
 
                                 let childInfoSpaceD = childInfos.first { (childInfo) -> Bool in
-                                    childInfo.name == spaceD.summary?.displayname
+                                    childInfo.name == spaceD.summary?.displayName
                                 }
 
                                 XCTAssertNotNil(childInfoSpaceC)
diff --git a/MatrixSDKTests/MXStoreRoomListDataManagerUnitTests.swift b/MatrixSDKTests/MXStoreRoomListDataManagerUnitTests.swift
index 562530b042..e68d6778dd 100644
--- a/MatrixSDKTests/MXStoreRoomListDataManagerUnitTests.swift
+++ b/MatrixSDKTests/MXStoreRoomListDataManagerUnitTests.swift
@@ -300,7 +300,7 @@ class MXStoreRoomListDataManagerUnitTests: XCTestCase {
         
         //  rename rooms by index
         for (index, summary) in result.enumerated() {
-            summary.displayname = "Room \(index + 1)"
+            summary.displayName = "Room \(index + 1)"
             if let event = MXEvent(fromJSON: [
                 "event_id": MXTools.generateTransactionId() as Any,
                 "room_id": summary.roomId,
diff --git a/MatrixSDKTests/MXStoreTests.m b/MatrixSDKTests/MXStoreTests.m
index 58db85b98f..771c237750 100644
--- a/MatrixSDKTests/MXStoreTests.m
+++ b/MatrixSDKTests/MXStoreTests.m
@@ -1686,7 +1686,7 @@ - (void)checkRoomSummary:(Class)mxStoreClass
 
                             XCTAssert(summary);
 
-                            XCTAssertEqualObjects(summary.displayname, @"A name");
+                            XCTAssertEqualObjects(summary.displayName, @"A name");
                             XCTAssertEqualObjects(summary.topic, @"A topic");
 
                             [expectation fulfill];
diff --git a/MatrixSDKTests/Mocks/MockRoomSummary.swift b/MatrixSDKTests/Mocks/MockRoomSummary.swift
index 3a8f3f4c5f..8d213984c9 100644
--- a/MatrixSDKTests/Mocks/MockRoomSummary.swift
+++ b/MatrixSDKTests/Mocks/MockRoomSummary.swift
@@ -25,7 +25,7 @@ internal class MockRoomSummary: NSObject, MXRoomSummaryProtocol {
     
     var avatar: String?
     
-    var displayname: String?
+    var displayName: String?
     
     var topic: String?
     
@@ -124,6 +124,6 @@ internal class MockRoomSummary: NSObject, MXRoomSummaryProtocol {
     }
     
     override var description: String {
-        return "<MockRoomSummary: \(roomId) \(String(describing: displayname))>"
+        return "<MockRoomSummary: \(roomId) \(String(describing: displayName))>"
     }
 }
diff --git a/changelog.d/pr-1731.bugfix b/changelog.d/pr-1731.bugfix
new file mode 100644
index 0000000000..80aacf0875
--- /dev/null
+++ b/changelog.d/pr-1731.bugfix
@@ -0,0 +1 @@
+Fixed a crash when roomSummary is nil.