(4-27) Why is the WebBrowser crashing when I execute certain Javascript functions?

I am trying to execute javascript in the webbrowser widget but it will crash when certain javascript functions are invoked!

For example, a simple alert("hello world"); will cause it to crash!

I send this JS through a Text Box widget. I have Button that will grab the text from the text box and send it to the Execute Javascript node (Note: this can work just by sending the script straight into the Execute Javascript node as well).

Anyone else having an issue? Im on a Mac running 4.27.

The crash is exception is this:
*** Terminating app due to uncaught exception ‘NSInternalInconsistencyException’, reason: ‘NSWindow drag regions should only be invalidated on the Main Thread!’

And if anyone is interested, this is the example app I sent to UE Helpdesk: GitHub - alainbloch/unrealbrowser: browser implementation in unreal