Error with my server (null exception)

Hy everyone !

I got a problem on my server !!
Sometimes my server crash due to a null exception.

I don’t know why this error happen!!

My server is running on debian with pterodactyl and with txadmin.

When TxAdmin detects a crash, TxAdmin restart automatically the server.

If you have any solution or if you have seen a topic that talk about this, juste HELP ME x)

Thanks !