From ad1c0046d92a17c4a9a2ac91d039a285f740eb17 Mon Sep 17 00:00:00 2001
From: fieldOfView <aldo@fieldofview.com>
Date: Sun, 15 Oct 2017 11:54:49 +0200
Subject: [PATCH] Fix crash when exiting Machine Settings

fixes #2609
---
 plugins/MachineSettingsAction/MachineSettingsAction.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/plugins/MachineSettingsAction/MachineSettingsAction.py b/plugins/MachineSettingsAction/MachineSettingsAction.py
index 80258ef548..4343c2c780 100755
--- a/plugins/MachineSettingsAction/MachineSettingsAction.py
+++ b/plugins/MachineSettingsAction/MachineSettingsAction.py
@@ -79,7 +79,7 @@ class MachineSettingsAction(MachineAction):
     @pyqtSlot()
     def onFinishAction(self):
         # Restore autoslicing when the machineaction is dismissed
-        if self._backend.determineAutoSlicing():
+        if self._backend and self._backend.determineAutoSlicing():
             self._backend.tickle()
 
     def _onActiveExtruderStackChanged(self):