So when I go to join DMU Public 1.12.2 My entire mine craft crashes and i have the latest test build so if anyone is able to help me I would greatly appreciate it so much! My game says nothing as a crash report

Oh I just got a crash report from mine craft it is Error: java.lang.NullPointerException: Unexpected error

I tried but it crashed my game before I could join the server so i never even join the server + the last time i was on i was at dunton

so does anyone know what to do to fix this or what?

The last thing i did on the server was find a random trap door and click on it and then i crashed

EDIT: My bad found my self on the latter but i hope someone knows what to do I wanted to make sure John got the present i put at his house