diff --git a/resources/lib/websocket_client.py b/resources/lib/websocket_client.py
index 52d8ace2..c904d607 100644
--- a/resources/lib/websocket_client.py
+++ b/resources/lib/websocket_client.py
@@ -346,5 +346,6 @@ class WebSocketClient(threading.Thread):
     def stop_client(self):
 
         self._stop_websocket = True
-        self._client.close()
+        if self._client is not None:
+            self._client.close()
         log.info("Stopping thread")