diff --git a/node/SocketIORouter.js b/node/SocketIORouter.js
index 1b8fffed..f8618f10 100644
--- a/node/SocketIORouter.js
+++ b/node/SocketIORouter.js
@@ -58,7 +58,7 @@ exports.setSocketIO = function(_socket)
       
     client.on('message', function(message)
     {
-      if(!message.protocolVersion|| message.protocolVersion != 2)
+      if(message.protocolVersion && message.protocolVersion != 2)
       {
         console.error("Protocolversion header is not correct:" + JSON.stringify(message));
         return;