Basically the lightning bolt was null when charged creeper got created and struck by this null lightning and Galacticraft wasn't prepared for the source of attack to be null.
Replaced with datawatcher update to just set the powered bit which is cleaner anyway
See this stack trace pastebin http://pastebin.com/bf16z2LD
Basically the lightning bolt was null when charged creeper got created and struck by this null lightning and Galacticraft wasn't prepared for the source of attack to be null.
Replaced with datawatcher update to just set the powered bit which is cleaner anyway