diff --git a/node-phantom.js b/node-phantom.js
index 8d8f31d..0e5eb7f 100644
--- a/node-phantom.js
+++ b/node-phantom.js
@@ -5,9 +5,10 @@ var socketio=require('socket.io');
 var child=require('child_process');
 
 function callbackOrDummy(callback){
-	if(callback===undefined)callback=function(){};
+	if(!callback) callback=function(){};
 	return callback;
 }
+
 function unwrapArray(arr) {
 	return arr && arr.length == 1 ? arr[0] : arr
 }