Bueno lo que me pasa es que cada que aparece un mob o una entidad en el mundo se me crashea el minecraft.
Esto me sale(puse desde que genere a una entidad):
[12:01:14] [Client thread/INFO]: [CHAT] Entidad generada con éxito
#
# A fatal error has been detected by the Java Runtime Environment:
#
# EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x2de42f90, pid=556, tid=1196
#
# JRE version: Java(TM) SE Runtime Environment (8.0_91-b15) (build 1.8.0_91-b15)
# Java VM: Java HotSpot(TM) Client VM (25.91-b15 mixed mode windows-x86 )
# Problematic frame:
# C [ialmgicd.dll+0x42f90]
#
# Failed to write core dump. Minidumps are not enabled by default on client versions of Windows
#
# An error report file with more information is saved as:
# C:\Documents and Settings\victor\Datos de programa\.minecraft\hs_err_pid556.log
#
# If you would like to submit a bug report, please visit:
# Java Crash Reporting Page
# The crash happened outside the Java Virtual Machine in native code.
# See problematic frame for where to report the bug.
#
AL lib: (EE) alc_cleanup: 1 device not closed
Java HotSpot(TM) Client VM warning: Using incremental CMS is deprecated and will likely be removed in a future release


Espero y me ayuden