Index: lams_tool_chat/src/java/org/lamsfoundation/lams/tool/chat/web/actions/LearningWebsocketServer.java
===================================================================
RCS file: /usr/local/cvsroot/lams_tool_chat/src/java/org/lamsfoundation/lams/tool/chat/web/actions/Attic/LearningWebsocketServer.java,v
diff -u -r1.1.2.5 -r1.1.2.6
--- lams_tool_chat/src/java/org/lamsfoundation/lams/tool/chat/web/actions/LearningWebsocketServer.java	5 May 2016 08:09:00 -0000	1.1.2.5
+++ lams_tool_chat/src/java/org/lamsfoundation/lams/tool/chat/web/actions/LearningWebsocketServer.java	15 Dec 2016 11:30:34 -0000	1.1.2.6
@@ -159,7 +159,9 @@
 			responseJSON.put("roster", rosterJSON);
 
 			// send the payload to the Learner's browser
-			websocket.session.getBasicRemote().sendText(responseJSON.toString());
+			if (websocket.session.isOpen()) {
+			    websocket.session.getBasicRemote().sendText(responseJSON.toString());
+			}
 		    }
 		} catch (Exception e) {
 		    LearningWebsocketServer.log.error("Error while building message JSON", e);