[Forge 1.15.2]Server Crash extrabows upgrades

[IchigoGames]

Not sure how it happened i was not there when it did but server crashed and i checked the report and it looks like its to do with this mod and a upgrade part.

Minecraft 1.15.2
forge 31.1.43
extrabows-v1.15.2 b1.jar
crash report https://pastebin.com/6uCaQ4sP

[MrMarnic]

Did this happen again or was it only one time? Because it maybe was just random.