Iron Golems crash the player when they walk

 Minecraft has crashed!      
      ----------------------      

Minecraft has stopped running because it encountered a problem; Exception while adding particle
A full error report has been saved to C:\Users\Ricardo\AppData\Roaming\.minecraft\crash-reports\crash-2012-11-01_15.07.07-client.txt for your convenience. Please include a copy of that file (Not this screen!) if you report this crash to anyone; without it, they will not be able to help fix the crash :(



--- BEGIN ERROR REPORT c75c664b --------
Full report at:
C:\Users\Ricardo\AppData\Roaming\.minecraft\crash-reports\crash-2012-11-01_15.07.07-client.txt

java.lang.NumberFormatException: For input string: ""
	at java.lang.NumberFormatException.forInputString(Unknown Source)
	at java.lang.Integer.parseInt(Unknown Source)
	at java.lang.Integer.parseInt(Unknown Source)
	at bad.b(SourceFile:1475)
	at bad.a(SourceFile:1364)
	at xv.a(SourceFile:809)
	at pi.c(SourceFile:107)
	at mc.j_(SourceFile:524)
	at xv.a(SourceFile:1315)
	at xv.g(SourceFile:1294)
	at xv.h(SourceFile:1194)
	at net.minecraft.client.Minecraft.l(SourceFile:1283)
	at net.minecraft.client.Minecraft.J(SourceFile:582)
	at net.minecraft.client.Minecraft.run(SourceFile:534)
	at java.lang.Thread.run(Unknown Source)
--- END ERROR REPORT 6a4b6653 ----------