It would appear that AbstractExplosion is loading null entities into the list, which other mods are not expecting to have to handle. Vanilla explosions do not place null entities in it's in-range list.

http://pastebin.com/x90Bzf82

Please report it to Pneumaticcraft too, cause it crashed MC

Nah, this is on my end, as I pass a null List.

Fixed by: 9645c70

(Forgot to close it in the commit itself -_-)

Any chance you could give us a timeline for when this will be corrected on Curse? I'm using the 1.8.9 version for a streamer's sub server pack and we discovered this issue during testing.

oh, 1.8.9.....

Probably monday

So, any update on when we're going to get this fix in a Curse release?