Client log: https://www.dropbox.com/s/p91pdgzw9s9du0k/fml_client_latest.txt?dl=0
Server log: No crash from the server, so it just says the usual crash message when someone unexpectedly leaves the server.
Client crash report: http://pastebin.com/Wm9tNWzC
Steps to causing the issue: The crash can happen from multiple sources; these can be trying to access an apiary or teleporting to any dimension using MystCraft or Mekanism. I am assuming it has something to do with rendering, since the crash is client side, but I'm not familiar with what func_76607_a does.
Let me know if you need any more information.