diff --git a/plugins/UM3NetworkPrinting/ClusterUM3OutputDevice.py b/plugins/UM3NetworkPrinting/ClusterUM3OutputDevice.py
index c0d538bb78..73acc02cae 100644
--- a/plugins/UM3NetworkPrinting/ClusterUM3OutputDevice.py
+++ b/plugins/UM3NetworkPrinting/ClusterUM3OutputDevice.py
@@ -194,6 +194,7 @@ class ClusterUM3OutputDevice(NetworkedPrinterOutputDevice):
             # the "reply" should be disconnected
             if self._latest_reply_handler:
                 self._latest_reply_handler.disconnect()
+                self._latest_reply_handler = None
 
 
     @pyqtSlot()