Try to find out the cause of the bug first, right now you only have a symptom. Upload your game to a separate place and start pulling out things until it works again, then start putting things back in one by one until you figure out what exact component is causing the issue.
Once you are done with that, and you are still certain it is not a bug in your code, refer to rule 15.1 of the developer forum rules on how to file a bug as new member:
https://devforum.roblox.com/t/official-rules-of-the-roblox-developer-forum/46429