So when exploring the server sometimes crashes and when i check the crash report i can see farseek appear in the log few times and the server have crashed twice.
Here's the crash log's:
Log 1: http://pastebin.com/UkN3sq5Q
Log 2: http://pastebin.com/7cbwYy0s
Now i can't say that these issues was exactly because of farseek but from the log it looks like it has to do something with biome/chunk generation with farseek named in the log.

Thanks wiloxe, I'll take a look. Meanwhile, merry Christmas! 🎅