Internal Server Error/Null Pointer Exception

Happening to everyone on my server. No matter what version Sponge I am using, from 1288 to 1326. Seems to point to the minecraft_server1.8.9.jar. Tried redownloading, same issue

Error log

It looks like the usercache.json file is corrupt. Try deleting it.

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Figured it out. It was Enjins latest plugin that was causing that above issue. Reported it to their plugin dev on their thread