Hi here's that bug that happened, this is probably a weird way to provide you with the info lol. I screencapped all of it when it popped up, and the Javascript Console too. Honestly the copied info and javascript console screenshot might have been two different crashes?? And my brain was like "oh i'm sure those were the same crash but i didn't copy the JS console info the first time i'll grab it now!", hopefully it's all helpful either way :'D
But yeah, for more info, it seemed to happen several times after I got the multiball boost, but not always, and it didn't happen at all until I got later in the space level. I did not copy anything from the final crash where it then wiped most of my save, unfortunately, because I didn't realise that it was a different crash than the rest had been. Good luck with the bug testing and developing!!