Minecraft version & Mod Version: MC 1.12.2 | Mod 1.7.2 | Forge 1.12.2-14.23.5.2823
Single player mode

Describe problem (what you were doing / what happened): Just opening an "old" world (opened the last time 3 weeks ago), and my games crashes immediatly. I don't have the time to do anything, it just crashes. The map was created and played with the 1.5.7 version of the mod before today. Everything works fine when opening a new world, so it seems to be only a problem of backwards compatibility :/

Crash log: here

Fixed it latest release