Expected Behavior

While wearing Slime Boots I charge up (hold right-click) my TConstruct:SlimeSling. Upon releasing the mouse my character should shoot up in the air. Like so: https://youtu.be/WCeDoDYaaeQ?t=723

Current Behavior

Upon releasing the mouse my game hard crashes

Possible Solution

No idea. I'm running the game with Optifine and I'm not sure if that is effecting anything.

Steps to Reproduce

1. Create the two items.
2. Put the boots on and equip the sling
3. Look at the ground and hold right click
4. Release

Log

https://gist.github.com/warpdragon/3c7f489f55c1df78052eebd7916f594d

Detailed Description

n/a

Ok i fixed it. It was because I was using OpenJDK instead of Java JRE. Works perfect now! Also my computer doesn't hate me now!