I actually managed to crash the application by choosing "while" then trying to while over the -> object.

Crashes with error:

[mobx] uncaught error in 'Reaction[Reaction]' Error: a reference of type 'PCRef/ReferencedDeclaration' could not resolve an object with id '__PCGlobalComponentDeclarationpaint'

And because the program appears stored in localStorage, refreshing the page doesn't help and now I'm "permanently" locked out.

(of course I can clear my LS).