The game crash randomly when walking around.
Seems that the generation method is calling check trunk method, and check trunk method is calling generation method, causing infinite recursive call.
Crash report:
crash-2019-05-02_22.09.49-server.txt

Hey, thanks for reporting. Looks like a mod compatibility issue, please see if you can reproduce the issue after removing mods. Thanks!

Oh I figured it out. It is a mod compatibility problem with a mod called "FuturePack". After removing that mod everything was fine.