diff --git a/cura/Settings/ExtruderManager.py b/cura/Settings/ExtruderManager.py
index 9c45815eb9..b7cbf80d65 100755
--- a/cura/Settings/ExtruderManager.py
+++ b/cura/Settings/ExtruderManager.py
@@ -470,7 +470,8 @@ class ExtruderManager(QObject):
         for extruder in self.getMachineExtruders(machine_id):
             ContainerRegistry.getInstance().removeContainer(extruder.userChanges.getId())
             ContainerRegistry.getInstance().removeContainer(extruder.getId())
-        del self._extruder_trains[machine_id]
+        if machine_id in self._extruder_trains:
+            del self._extruder_trains[machine_id]
 
     ##  Returns extruders for a specific machine.
     #