Index: lams_tool_forum/src/java/org/lamsfoundation/lams/tool/forum/service/ForumService.java
===================================================================
diff -u -rf0a3eca9eb63c95f874f2c689e8be0ddbb50ff3f -r6d8df8768f59d302828ef64bf3cb7c8d485975b8
--- lams_tool_forum/src/java/org/lamsfoundation/lams/tool/forum/service/ForumService.java	(.../ForumService.java)	(revision f0a3eca9eb63c95f874f2c689e8be0ddbb50ff3f)
+++ lams_tool_forum/src/java/org/lamsfoundation/lams/tool/forum/service/ForumService.java	(.../ForumService.java)	(revision 6d8df8768f59d302828ef64bf3cb7c8d485975b8)
@@ -514,7 +514,7 @@
 		report.setDateMarksReleased(new Date());
 		if (notifyLearnersOnMarkRelease) {
 		    ForumUser user = msg.getCreatedBy();
-		    StringBuilder notificationMessage = notificationMessages.get(user.getUserId());
+		    StringBuilder notificationMessage = notificationMessages.get(user.getUserId().intValue());
 		    if (notificationMessage == null) {
 			notificationMessage = new StringBuilder();
 		    }