I think all the errors you're seeing are due to running out of heap. How much memory do you have? Is there some per-process limit, perhaps to RLIMIT_AS?
Edit 35 minutes later. I can reproduce that it dies for me at the precise same iteration as you. And RLIMIT_AS is infinity, so that's not the issue. I've pinged the author for comment.
Thank you. But now I think it would be wise not to complain about the issue on the forum, but rather to create an issue on the project's github. Will do it now.
Well, thanks for the bug report. Well, I'll look into it when I have the time: the work which pays my bills has caught up with me once again and I don't have a lot of time to do hobby development. :)