Forge Version: 10.13.3.1403
Mod Version: Beta 5b
Crash Report: http://pastebin.com/zkt86TvE
Launcher: MultiMC
Java Version: JRE 1.8.0 Update 45
Description: Beta 5b client side crash when going through nether portal on a server only. Singleplayer seems fine.

Just saw that this may have already been addressed, as I'm getting the same FakeWorldClient as #63 , sorry!