diff --git a/src/Mod/TechDraw/Gui/ViewProviderViewPart.cpp b/src/Mod/TechDraw/Gui/ViewProviderViewPart.cpp
index e4fb272e42..017cbc344f 100644
--- a/src/Mod/TechDraw/Gui/ViewProviderViewPart.cpp
+++ b/src/Mod/TechDraw/Gui/ViewProviderViewPart.cpp
@@ -132,7 +132,7 @@ ViewProviderViewPart::~ViewProviderViewPart()
 
 void ViewProviderViewPart::onChanged(const App::Property* prop)
 {
-    if (getViewPart()->isDerivedFrom(TechDraw::DrawViewDetail::getClassTypeId()) &&
+    if (auto part = getViewPart(); part && part->isDerivedFrom(TechDraw::DrawViewDetail::getClassTypeId()) &&
         prop == &(HighlightAdjust)) {
         auto detail = static_cast<DrawViewDetail*>(getViewPart());
         auto baseDvp = dynamic_cast<DrawViewPart*>(detail->BaseView.getValue());