diff --git a/WebApp/src/uk/ac/exeter/QuinCe/data/Instrument/FileDefinition.java b/WebApp/src/uk/ac/exeter/QuinCe/data/Instrument/FileDefinition.java
index d4cb72001..ecc72dabf 100644
--- a/WebApp/src/uk/ac/exeter/QuinCe/data/Instrument/FileDefinition.java
+++ b/WebApp/src/uk/ac/exeter/QuinCe/data/Instrument/FileDefinition.java
@@ -658,9 +658,11 @@ public RunTypeAssignments getRunTypes() {
    * @return The run type values
    */
   public List<String> getRunTypeValues() {
-    List<String> values = null;
+    List<String> values;
 
-    if (null != runTypes) {
+    if (null == runTypes) {
+      values = new ArrayList<String>(0);
+    } else {
       values = new ArrayList<String>(runTypes.size());
       values.addAll(runTypes.keySet());
     }
diff --git a/WebApp/src/uk/ac/exeter/QuinCe/web/files/MissingRunType.java b/WebApp/src/uk/ac/exeter/QuinCe/web/files/MissingRunType.java
index 5bb302a67..9c71343d1 100644
--- a/WebApp/src/uk/ac/exeter/QuinCe/web/files/MissingRunType.java
+++ b/WebApp/src/uk/ac/exeter/QuinCe/web/files/MissingRunType.java
@@ -1,15 +1,21 @@
 package uk.ac.exeter.QuinCe.web.files;
 
-import java.util.List;
+import java.util.Set;
 
 import uk.ac.exeter.QuinCe.data.Instrument.FileDefinition;
 import uk.ac.exeter.QuinCe.data.Instrument.RunTypes.RunTypeAssignment;
 
 public record MissingRunType(FileDefinition fileDefinition,
-  RunTypeAssignment runType) {
-  protected static boolean contains(List<MissingRunType> list,
+  RunTypeAssignment runType) implements Comparable<MissingRunType> {
+
+  protected static boolean contains(Set<MissingRunType> list,
     FileDefinition fileDefinition, String runName) {
     return list.stream().anyMatch(r -> r.fileDefinition.equals(fileDefinition)
       && r.runType.getRunName().equals(runName));
   }
+
+  @Override
+  public int compareTo(MissingRunType o) {
+    return runType.getRunName().compareTo(o.runType.getRunName());
+  }
 }
diff --git a/WebApp/src/uk/ac/exeter/QuinCe/web/files/MultipleFileUploadBean.java b/WebApp/src/uk/ac/exeter/QuinCe/web/files/MultipleFileUploadBean.java
index 0847bdbb8..01b20c15c 100644
--- a/WebApp/src/uk/ac/exeter/QuinCe/web/files/MultipleFileUploadBean.java
+++ b/WebApp/src/uk/ac/exeter/QuinCe/web/files/MultipleFileUploadBean.java
@@ -1,6 +1,5 @@
 package uk.ac.exeter.QuinCe.web.files;
 
-import java.util.ArrayList;
 import java.util.Collection;
 import java.util.List;
 import java.util.TreeSet;
@@ -29,7 +28,7 @@ public class MultipleFileUploadBean extends FileUploadBean {
    */
   private TreeSet<UploadedDataFile> dataFiles = new TreeSet<UploadedDataFile>();
 
-  private List<MissingRunType> unrecognisedRunTypes;
+  private TreeSet<MissingRunType> unrecognisedRunTypes;
 
   @Override
   public void processUploadedFile() {
@@ -131,7 +130,7 @@ private void unsetDataFiles() {
   }
 
   private void buildUnrecognisedRunTypes() {
-    unrecognisedRunTypes = new ArrayList<MissingRunType>();
+    unrecognisedRunTypes = new TreeSet<MissingRunType>();
 
     for (UploadedDataFile file : dataFiles) {
       for (RunTypeAssignment runType : file.getMissingRunTypes()) {
@@ -144,7 +143,7 @@ private void buildUnrecognisedRunTypes() {
     }
   }
 
-  public List<MissingRunType> getUnrecognisedRunTypes() {
+  public TreeSet<MissingRunType> getUnrecognisedRunTypes() {
 
     if (null == unrecognisedRunTypes) {
       buildUnrecognisedRunTypes();