Crash with dungeons arise

I don't know if this is really a "woot" or a "When Dungeons Arise" issue
But my server does crash on world generation *sometimes* 

Crashlog: https://gist.github.com/Seniorendi/ae7ca5f20c10804e5dcea9b8c29cbb1a
I see dungeons arise and woot in this crashlog, this is the reason I post it here. I will also report this to dungeons arise