Okay, thanks for the report. 👍 Maybe if you could export the problematic project, I could take a look at why it stopped responding.
Good news: version 0.12.0 now has a panel at the bottom of the window, in order to display error messages:
https://haroldo-ok.itch.io/vcs-game-maker/devlog/645573/version-0120-is-now-avai...