Index: lams_learning/src/java/org/lamsfoundation/lams/learning/presence/PresenceWebsocketServer.java
===================================================================
RCS file: /usr/local/cvsroot/lams_learning/src/java/org/lamsfoundation/lams/learning/presence/Attic/PresenceWebsocketServer.java,v
diff -u -r1.1.2.5 -r1.1.2.6
--- lams_learning/src/java/org/lamsfoundation/lams/learning/presence/PresenceWebsocketServer.java	5 May 2016 08:09:24 -0000	1.1.2.5
+++ lams_learning/src/java/org/lamsfoundation/lams/learning/presence/PresenceWebsocketServer.java	15 Dec 2016 11:30:59 -0000	1.1.2.6
@@ -146,7 +146,9 @@
 		    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) {
 		    PresenceWebsocketServer.log.error("Error while building message JSON", e);
 		}