Mad Cows Weapons LUA Errors

I am trying to setup a server with mad cows weapons pack, and sometimes, when somebody gets killed, they get kicked for one of the two of these LUA errors:


[Mad Cows Weapons UPDATED!!] lua/weapons/weapon_mad_base/shared.lua:696: Tried to use a NULL entity!
  1. __index - [C]:-1
   2. unknown - lua/weapons/weapon_mad_base/shared.lua:696

or


[Mad Cows Weapons UPDATED!!] lua/weapons/weapon_mad_rpg/shared.lua:160: Tried to use a NULL entity!
  1. __index - [C]:-1
   2. unknown - lua/weapons/weapon_mad_rpg/shared.lua:160

What is going wrong? Any help is appreciated.