From 06a01d0fee1cac1f5b4777f55e02ce02412adff8 Mon Sep 17 00:00:00 2001
From: Markus Lampert <markus@bibi.ca>
Date: Sun, 24 Sep 2017 14:26:18 -0700
Subject: [PATCH] Fixed segfault on shutdown.

---
 src/Mod/Path/PathScripts/PathOpGui.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/Mod/Path/PathScripts/PathOpGui.py b/src/Mod/Path/PathScripts/PathOpGui.py
index 1cba3cbe71..5c2474da9e 100644
--- a/src/Mod/Path/PathScripts/PathOpGui.py
+++ b/src/Mod/Path/PathScripts/PathOpGui.py
@@ -770,6 +770,8 @@ class TaskPanel(object):
         return True
 
     def preCleanup(self):
+        for page in self.featurePages:
+            page.onDirtyChanged(None)
         FreeCADGui.Selection.removeObserver(self)
         FreeCADGui.Selection.removeObserver(self.s)
         self.obj.ViewObject.Proxy.clearTaskPanel()