Crash when Generating New Chunks in a World.
(Note: This May Not be MrTJPCore's Fault, but it was Referenced in the Crash Report. This May be Caused by Realistic Terrain Generation / Mekanism)

Crash Report:
http://pastebin.com/4JsJKAY1

Issue in Mekanism's Issues: mekanism/Mekanism#3975
Issue in Realistic Terrain Generation's Issues: Team-RTG/Realistic-Terrain-Generation#1049

1.7 is ancient, was likely tjcore accidentally generating chunks when it shouldn't have.