Throw an exception button has a typo in a function call.
Don't throw an exception button also has a typo in a function call, but it's wrapped in a try/catch. So, in order to find this exception you will have to enable catching uncaught exceptions in the debugger of your browser. This works in IE8-10 but you will most likely end up on the wrong frame in the call stack. This feature works best in IE11.