diff --git a/lib/server/webDAVServer/Resource.js b/lib/server/webDAVServer/Resource.js
index 0bb03539..c86dbbfc 100644
--- a/lib/server/webDAVServer/Resource.js
+++ b/lib/server/webDAVServer/Resource.js
@@ -92,7 +92,7 @@ function addResourceTree(_rootResource, _resoureceTree, _callback) {
         };
         array.forEach(function (r) { return _this.addResourceTree(rootResource, r, doneArray_1); });
     }
-    else if (resoureceTree.fsManager) {
+    else if (resoureceTree.fsManager !== undefined) {
         rootResource.addChild(resoureceTree, callback);
     }
     else {
diff --git a/src/server/webDAVServer/Resource.ts b/src/server/webDAVServer/Resource.ts
index 00a85e65..29643fe6 100644
--- a/src/server/webDAVServer/Resource.ts
+++ b/src/server/webDAVServer/Resource.ts
@@ -118,7 +118,7 @@ export function addResourceTree(_rootResource : IResource | ResourceTreeNode, _r
 
         array.forEach((r) => this.addResourceTree(rootResource, r, doneArray));
     }
-    else if((resoureceTree as IResource).fsManager)
+    else if((resoureceTree as IResource).fsManager !== undefined)
     { // resoureceTree is IResource
         rootResource.addChild(resoureceTree as IResource, callback);
     }