Does pavlovia ask to repeat the experiment if it crashes?

I would recommend that you upgrade to 2020.1.3, 2020.2.10 or 2021.1.4

2020.2.10 fixed some of the memory leak issues of 2020.1 but broke a few other things, most notably trials.thisN. I’m not sure about adblockers, but here are a few links:

This last one is interesting – since it suggests that an adblocker might be triggered by a resource called advertisement. Do you have anything like that?