i don't know what happened, i was just mining
crash-2017-04-05_12.19.59-server.txt
please help. thanks

Apparently I forgot to change one thing when porting some 1.10.2 code to 1.11.2, which evidently let a null element enter a list where there shouldn't be any null elements (then the game crashes when it tries to save the null value). I'm gonna do some additional debugging for any other case where it can crash, then release an update.

thanks so much!