diff --git a/plugins/USBPrinting/USBPrinterOutputDeviceManager.py b/plugins/USBPrinting/USBPrinterOutputDeviceManager.py
index eb0193c0c0..8f7c06419b 100644
--- a/plugins/USBPrinting/USBPrinterOutputDeviceManager.py
+++ b/plugins/USBPrinting/USBPrinterOutputDeviceManager.py
@@ -236,7 +236,7 @@ class USBPrinterOutputDeviceManager(QObject, OutputDevicePlugin, Extension):
                 self.getOutputDeviceManager().removeOutputDevice(serial_port)
             self.connectionStateChanged.emit()
         except KeyError:
-            pass  # no output device by this device_id found in connection list.
+            Logger.log("w", "Connection state of %s changed, but it was not found in the list")
 
 
     @pyqtProperty(QObject , notify = connectionStateChanged)