Problema con mi minecraft

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™ SE Runtime Environment (8.0_91-b15) (build 1.8.0_91-b15)

Java VM: Java HotSpot™ 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™ Client VM warning: Using incremental CMS is deprecated and will likely be removed in a future release

Espero y me ayuden