Shot in the dark patch for MAINT-3353

indra/llwindow/llwindowcallbacks.cpp

@@ -122,6 +122,7 @@ void LLWindowCallbacks::handleResize(LLWindow *window, const S32 width, const S3
 
 void LLWindowCallbacks::handleFocus(LLWindow *window)
 {
+    LL_WARNS("COCOA") << "Called handleFocus proto" << LL_ENDL;
 }
 
 void LLWindowCallbacks::handleFocusLost(LLWindow *window)

indra/llwindow/llwindowmacosx.cpp

@@ -331,7 +331,14 @@ void callMouseExit()
 
 void callWindowFocus()
 {
-	gWindowImplementation->getCallbacks()->handleFocus(gWindowImplementation);
+    if ( gWindowImplementation && gWindowImplementation->getCallbacks() )
+    {
+        gWindowImplementation->getCallbacks()->handleFocus (gWindowImplementation);
+    }
+    else
+    {
+        LL_WARNS("COCOA") << "Window Implementation or callbacks not yet initialized." << LL_ENDL;
+    }
 }
 
 void callWindowUnfocus()