[1.7.10]Mod crashes server but not client

[SSJ3Bane]

So I made a mod to add a pouch that holds items and allows for one of the items to be selected and used. It works perfectly in single player. However, as the title says, it crashes a server that hosts it. I would really appreciate help on the subject. I document all my code and try to make the variable names as descriptive as possible, though I lack in comments.

https://bitbucket.org/ssj3bane/banemod/src/master/

Per request, I can explain any section of the code and what it does.
Crash log is attached.

From first inspection, it's something to do with an event handler.

Thank you!

banemod-1.0.jar

crash-2018-10-15_20.33.15-server.txt

Edited October 16, 2018 by SSJ3Bane

[Cadiboo]

Sorry we don't support 1.7.10 (or any versions under 1.9) on this forum anymore due to its age (4+ years old). We simply don't know how to write code for it and help you anymore. You can go to the Minecraft Forum where I think that they still still support older versions, or update to a modern version of Minecraft (the latest version or the one before it) to receive support on this forum.

Edited October 16, 2018 by Cadiboo

[Draco18s]

1.7.10 is no longer supported here.

[SSJ3Bane]

Oh alright. Thanks anyways