After build, Unreal Editor closes after 10s

OK, I don’t know if I have done this correctly.

I found: GEngine->DeferredCommands.Add( TEXT(“CLOSE_SLATE_MAINFRAME”));
command in MainFrameActions.cpp file.

I added red circle break point next to this line.
And build and F5 run. (In Development Editor - mode)

When Unreal Editor launched I had got massive Output in VS2013.
But when Unreal Editor crashed after 10s I had nothing more… Maybe i should build it in debug mode??

In attachment link text is Output from VS2013: