Assembly: Fix the crash described in #18475

src/Gui/CommandDoc.cpp

@@ -1385,6 +1385,11 @@ void StdCmdDelete::activated(int iMsg)
             bool autoDeletion = true;
             for(auto &sel : sels) {
                 auto obj = sel.getObject();
+                if (obj == nullptr){
+                    Base::Console().DeveloperWarning("StdCmdDelete::activated",
+                                                     "App::DocumentObject pointer is nullptr\n");
+                    continue;
+                }
                 for(auto parent : obj->getInList()) {
                     if(!Selection().isSelected(parent)) {
                         ViewProvider* vp = Application::Instance->getViewProvider(parent);