Index: lams_tool_lamc/src/java/org/lamsfoundation/lams/tool/mc/model/McContent.java
===================================================================
diff -u -r7526ca9885157455bb66079b6cc8a3571f819de9 -r6553f690f1017ee47046a67f4de84d646435bf29
--- lams_tool_lamc/src/java/org/lamsfoundation/lams/tool/mc/model/McContent.java	(.../McContent.java)	(revision 7526ca9885157455bb66079b6cc8a3571f819de9)
+++ lams_tool_lamc/src/java/org/lamsfoundation/lams/tool/mc/model/McContent.java	(.../McContent.java)	(revision 6553f690f1017ee47046a67f4de84d646435bf29)
@@ -124,7 +124,7 @@
 
     @OneToMany(mappedBy = "mcContent", cascade = CascadeType.ALL)
     @SortComparator(QbToolQuestion.QbToolQuestionComparator.class)
-    private Set<McQueContent> mcQueContents = new TreeSet<>();
+    private Set<McQueContent> mcQueContents;
 
     @OneToMany(mappedBy = "mcContent", cascade = CascadeType.ALL, orphanRemoval = true)
     private Set<McSession> mcSessions;
@@ -163,7 +163,7 @@
 
     /** default constructor */
     public McContent() {
-	this.mcQueContents = new HashSet<>();
+	this.mcQueContents = new TreeSet<>();
 	this.mcSessions = new HashSet<>();
     }