dont know if this is the plugin is doing it but only on islandcraft world
i forgot to add the report
crash-2016-12-12_11.32.46-server.txt

Thanks for reporting and for the crash log. Looks like a legit issue!

It's been a month and have you found a fix for the issue just wondering

Sorry, not the reply you're waiting for, but just letting you know I haven't got around to it yet.

I came here looking to see if other people were having problems, and I see they are. I am not using this plugin but my server crashes as well. I'm just letting you know it is not a problem with this plugin.