Alycos

Hi, my server is running minecraft 1.12.2 and forge recommanded 1.12.2 - 14.23.2.2611 The server is crashing from time to time with the exact same crash report. It always happens when no one is playing, and it already corrupted one world. So we created a new world, but the same crash keep happening. I don't know if the problem comes from forge or a mod, as the crash report is mostly refering to a class called fastutil which is part of java (from what i've read). It is difficult to isolate the problem, because nothing really triggers the crash. It happens once every 1-2 days. I'm sorry to bother you if the problem comes from a mod, and if it's the case, i will gladly go post an issue on the appropriate forum. Here's the crash report, thanks for the help :