When viewing a replay going right left right left (ie. spamming adadadad on standard controls) crashes the game after you've build up a certain speed.

I'd rather not register in a forum which doesn't even manage to escape the search query.

Where do I even find that crashlog?

In that case we can't help you.

Thanks for your report! Could you please open a bug report in the ReplayMod Forums? We don't use the GitHub issue tracker. http://replaymod.com/forum
Make sure to include the ReplayMod version you're using and the full crash report, so we can fix the issue.