removed disconnect clear

app.js

@@ -28,7 +28,7 @@ io.on('connection', function(socket){
     io.sockets.emit('updateUserCount', Object.keys(io.engine.clients).length);
     socket.on('disconnect', function(){
       io.sockets.emit('updateUserCount', Object.keys(io.engine.clients).length);
-      io.sockets.emit('clearExternalData');
+      //io.sockets.emit('clearExternalData');
     });
   	console.log('a user connected');
   	socket.on('bpm', function(newBpm){

public/client.js

@@ -30,9 +30,11 @@ $(function(){
         externalGrid = data;
     });
 
+    /*
     iosocket.on('clearExternalData', function(){
         externalGrid = null;
     });
+*/
 
     iosocket.on('updateUserCount', function(userCount){
         userCount--;