diff --git a/lib/socket.js b/lib/socket.js
index be97d3d35..4623268fc 100644
--- a/lib/socket.js
+++ b/lib/socket.js
@@ -393,8 +393,8 @@ Socket.prototype.sendPacket = function (type, data, options, callback) {
 
     this.writeBuffer.push(packet);
 
-    // add send callback to object
-    this.packetsFn.push(callback);
+    // add send callback to object, if defined
+    if (callback) this.packetsFn.push(callback);
 
     this.flush();
   }