Help (attempt to call method 'AddEntityRelationship' (a nil value))

[Zenocut]

Why does this:
hook.Add("PlayerDeath","YouGotRekt",function( victim, inflictor, attacker )
    if(victim:IsPlayer() and victim:IsValid() and ACforget:GetInt() == 1) then
        for k,v in pairs(ents.GetAll()) do
            if(v:IsNPC() and v:IsValid() and v:GetClass() == "npc_citizen" and v:GetName() == "OnceAngry" or "VeryAngry") then
               v:AddEntityRelationship(victim, D_NU, 99)
             end
        end
    end
 end)
give me this:
[ERROR] modname:56: attempt to call method 'AddEntityRelationship' (a nil value)
  1. v - lua/modname.lua:56
   2. unknown - lua/includes/modules/hook.lua:84

[Zenocut]

Okay, I fixed it myself

[Rekson]

a nil value means its returning empty/nothing that is why you're getting that error.

[Zenocut]

This was the problem.
I changed it to
v:GetName() == "OnceAngry" or v:GetName() == "VeryAngry"