On sleeping the game crashes with a java.lang.VerifyError

The game involved is a stored game. (Level.dat attached)
I start the current TechnicLauncher 4.234, start the vanilla mod pack, it launches vanilla MineCraft 1.8.1.
The game is loaded. The time of the game is nearly night, so I enter the next bed, and the game crashes.
The crash report is also attached.

This is similar to the report
http://hopper.minecraft.net/crashes/minecraft/MCX-2258218/
but I assume, that the vanilla game from TechnicLauncher is unmodded, so I just want to add this info here as well.