Index: lams_tool_forum/src/java/org/lamsfoundation/lams/tool/forum/service/ForumService.java
===================================================================
diff -u -r00abe44ce0b902bd6c797e3a17e7d36cf73af34c -rf0a3eca9eb63c95f874f2c689e8be0ddbb50ff3f
--- lams_tool_forum/src/java/org/lamsfoundation/lams/tool/forum/service/ForumService.java	(.../ForumService.java)	(revision 00abe44ce0b902bd6c797e3a17e7d36cf73af34c)
+++ lams_tool_forum/src/java/org/lamsfoundation/lams/tool/forum/service/ForumService.java	(.../ForumService.java)	(revision f0a3eca9eb63c95f874f2c689e8be0ddbb50ff3f)
@@ -751,6 +751,7 @@
 		Message msg = (Message) iter.next();
 		// set this message forum Uid as toContent
 		if (!msg.getIsAuthored() || msg.getToolSession() != null) {
+		    iter.remove();
 		    continue;
 		}
 		msg.setReplyNumber(0);