http://pastebin.com/GgqGPWw4

This is with latest versions of Special mobs and Zombie Awareness, too. I'm not sue which mod's doing what with this crash. All I know is that t the crashes started on the first night after placing a Malisis Door.

I've taken a wild guess on why and how that error could happen as it really seems impossible according to the code.
I don't think it has anything to do with special mobs unless they included some sort of multi-threading (which I doubt).
Anyway the potential fix will be available in the next update.

Special mobs bug I think.

I suspected as much as well, until I saw this. I really don't know, though. I'll bring it up with FatherToast. Thanks

I'm beginning to wonder if maybe I've mutilated something somehow, since no one else seems to be having this issue, but I just got another ray-trace crash. Same mods. Same game - this time with a vanilla zombie. Slightly different error report.

It's the same error.
But I am so deep into updating to 1.8 that I didn't have time to make a new release for 1.7 :(
[Edit :]Actually no, it's not exactly the same error, but it's also one already fixed and waiting to be release.

:) thank you. glad to hear you're updating and staying with it too.