What happens:

Activation of the sound location for use on the dark steel helmet crashes the game when the hot key to active it is used.

Steps to reproduce:

1. Craft the Dark Steel Helmet
2. Combine the Helmet with the note block to get the sound location ability
3. Press the hotkey to activate the ability

Affected Versions (Do not use "latest"):

• EnderIO: EnderIO-1.8.9-3.0.0.21_alpha
• EnderCore: EnderCore-1.8.9-0.3.0.13-beta
• Minecraft: 1.8.9
• Forge: 11.15.1.1808

Your most recent log file where the issue was present:

http://pastebin.com/rPbr9rJ4

Please don't use features that are not yet ported to 1.8. Thank you.