Sketcher: fix access to isPerformingTransaction on null pointer

=============================================================== Fixes this crash: https://forum.freecadweb.org/viewtopic.php?f=3&t=48414#p414255
FreeCAD · Jul 7, 2020 · 39b81e4 · 39b81e4
1 parent c3da895
commit 39b81e4
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/src/Mod/Sketcher/App/SketchObject.cpp b/src/Mod/Sketcher/App/SketchObject.cpp
@@ -7040,7 +7040,9 @@ void SketchObject::onChanged(const App::Property* prop)
 
     if (prop == &Geometry || prop == &Constraints) {
 
-        if(getDocument()->isPerformingTransaction()) { // undo/redo
+        auto doc = getDocument();
+
+        if(doc && doc->isPerformingTransaction()) { // undo/redo
             setStatus(App::PendingTransactionUpdate, true);
         }
         else {