Custom modpack crash report on server

[dooblykid]

I have been working on this custom modpack for a couple months and have come across many a crash report and have fixed them all fairly easily. But just recently for my modpack  Legendary Dundeoneering http://www.technicpack.net/modpack/legendary-dungeoneering.680762 server has been getting this crash report http://pastebin.com/fwKXB7EY I am not sure if this crash only happens on the server or if it happens in single player to as I have only had experience with the Multi Player side of my modpack but this Crash report has been very puzzling to me. I have been able to fix most entity ticking crash reports by changing some code and or removing a mod. but this is very difficult to do as this crash is being caused by a plain old zombie. Its happened multiple times at random usually with zombie spawners but I cant pinpoint the cause of the crash. Can someone please provide an answer to this as I have been working to set up an official server and dont want the server being full of crashes when it is released. 

[dooblykid]

Can someone please help me with this? Its getting to the point where my server/pack is becoming unplayable 

[AetherPirate]

Looks like you are running Cauldron, I have no experience with that, but I did notice you are running java 7, perhaps trying 8 would be worthwhile. 

[dooblykid]

That doesnt help me cuz it even crashes my official multicraft server with the same crash log