Was messing around with testing the rubber boots and I jumped down from a height of approximately 50 blocks. When I landed, the game froze and went to a "Saving Chunks" Screen.
This is the Error that was given:
java.lang.NullPointerException
at sz.a(EntityPlayer.java:626)
at ic2.common.ItemArmorRubBoots.absorbFalling(ItemArmorRubBoots.java:74)
at mod_IC2.OnTickInGame(mod_IC2.java:1228)
at ic2.platform.Ic2.OnTickInGame(Ic2.java:373)
at BaseMod.OnTickInGame(BaseMod.java:80)
at ModLoader.OnTick(ModLoader.java:1016)
at EntityRendererProxy.b(EntityRendererProxy.java:16)
at net.minecraft.client.Minecraft.run(SourceFile:689)
at java.lang.Thread.run(Thread.java:636)
Stopping!