Issue Description:

Game crashes when "release" button is pressed on PC

What happens:

https://gist.github.com/Kagynt/ac130ccce8d07eeaeb575f25e4dd3e92

What you expected to happen:

release pkmn functionality

Steps to reproduce:

1.Enter the PC GUI
2.Click the "release" button

Affected Versions (Do not use "latest"):

• Pokecube Core: 5.0.0.t
• Pokecube Revival (if applicable): 5.0.0.i
• Pokecube Mobs (if applicable): 2.4.2
• Minecraft: 1.11
• Forge: 1.11-13.19.0.2159

This is fixed in 5.0.0.u

https://minecraft.curseforge.com/projects/pokecube-core/files/2348998