More robust websocket writting

client.coffee

@@ -44,7 +44,10 @@ class Client
             @.subscriptionManager.remove(routing_key)
 
     sendPong: ->
+        try
             @ws.send(JSON.stringify({cmd: "pong"}))
+        catch e
+            console.error("Error: ", e)
 
     close: () ->
         if @.subscriptionManager

subscription.coffee

@@ -14,7 +14,10 @@ class Subscription
         clientMsg.routing_key = msg.fields.routingKey
         clientMsgStr = JSON.stringify(clientMsg)
 
+        try
             @ws.send clientMsgStr
+        catch e
+            console.error("Error: ", e)
 
     start: () ->
         queue.subscribe(@client_id, @routing_key, @.handleMessage.bind(@))