diff --git a/lib/client/websocket-tracker.js b/lib/client/websocket-tracker.js
index 16531c7..e21fa4c 100644
--- a/lib/client/websocket-tracker.js
+++ b/lib/client/websocket-tracker.js
@@ -137,6 +137,8 @@ WebSocketTracker.prototype.destroy = function (cb) {
     } catch (err) {
       cb(null)
     }
+  } else {
+    cb(null)
   }
 
   self.socket = null