+ add try/catch block to notify() method

src/Gui/Application.cpp

@@ -1554,6 +1554,7 @@ public:
 
         // Print some more information to the log file (if active) to ease bug fixing
         if (receiver && event) {
+            try {
                 std::stringstream dump;
                 dump << "The event type " << (int)event->type() << " was sent to "
                      << receiver->metaObject()->className() << "\n";
@@ -1574,6 +1575,10 @@ public:
                     Base::Console().Log("%s",str.c_str());
                 }
             }
+            catch (...) {
+                Base::Console().Log("Invalid recipient and/or event in GUIApplication::notify\n");
+            }
+        }
 
         return true;
     }