The solution viewer crashes very frequently in the Yiddish course

[sassfb]

I often cannot complete a lesson in the Yiddish course without having the solution viewer crash. A notice appears telling me that it's crashed and says to click the bubble to reload. I click the bubble, but I don't think that it's really working again (because I don't see solutions) until I finish the lesson and then manually reload the page when I start the next lesson. I don't know if it's related, but I often advance to the next question without waiting for the solutions count/link to appear. I think it takes longer to make the solutions available for Yiddish than for Spanish. Not sure it's relevant, but I'm using a Mac mini, MacOS Catalina.

[blmage]

This is probably related to some exercises having too many solutions / a solution graph leading to a lot of duplication (from what I know, this also happens sometimes on the Japanese course).

I still need to find a reliable / efficient way to detect this kind of graphs, and to short-circuit the process to prevent the extension from getting stuck, but this is definitely a priority.

Thanks for your report!