Index: lams_tool_forum/src/java/org/lamsfoundation/lams/tool/forum/service/ForumOutputFactory.java
===================================================================
diff -u -rf83f367fdcf4b417d1ccbd74cca5dd88dc24df7a -rdf0621bec34d5b312120ba8e4476d5bfd3d77825
--- lams_tool_forum/src/java/org/lamsfoundation/lams/tool/forum/service/ForumOutputFactory.java	(.../ForumOutputFactory.java)	(revision f83f367fdcf4b417d1ccbd74cca5dd88dc24df7a)
+++ lams_tool_forum/src/java/org/lamsfoundation/lams/tool/forum/service/ForumOutputFactory.java	(.../ForumOutputFactory.java)	(revision df0621bec34d5b312120ba8e4476d5bfd3d77825)
@@ -148,7 +148,7 @@
 	    Map<Date, Set<String>> answers = new HashMap<Date, Set<String>>();
 
 	    ForumUser user = forumService.getUserByUserAndSession(learnerId, toolSessionId);
-	    List<MessageDTO> userMessages = forumService.getMessagesByUserUid(user.getUid(), toolSessionId);
+	    List<MessageDTO> userMessages = user == null ? null : forumService.getMessagesByUserUid(user.getUid(), toolSessionId);
 
 	    if (userMessages != null) {
 		for (MessageDTO messageDTO : userMessages) {