I was having a similar issue, with errors from test_submit_run() when either RUNS > 83, because then size <= 1. It was an AttributeError: 'NoneType'. I had to correct the sorting algorithm to make sure that if len(runs) <= 1, it would return runs (as it is already sorted). My error was specifically because I had just written `return` and not `return runs`, so it was NoneType. When it is running more tests, it is more likely to encounter a situation that the code no longer works. This is why it was only working for RUNS <= 83, because after that, size would be 1, so the error would occur. I was able to identify this by adding `try... except...` and printing size when the error occurred. I am now passing all tests with the new version (27 March 2024 4:05PM) of test_speedrunning.py