if !Ply:Alive() then hook.Remove("Think", "ClimbGrab"..Ply:UniqueID());
	    elseif !ClimbSwep.Grab or Ply:GetMoveType() != MOVETYPE_NONE then Forget(); return
        elseif !IsOneHanded() then Forget();
            return
        elseif IsValid(ClimbSwep.Parent) then

            if ClimbSwep.Parent:GetPhysicsObject():IsMoveable() then

                if math.abs(ClimbSwep.OldVelocity - ClimbSwep.Parent:GetVelocity():Length()) >= 500 then Forget()
                else

                    ClimbSwep.OldVelocity = ClimbSwep.Parent:GetVelocity():Length()
                    Ply:SetLocalVelocity(Vector(0, 0, 0))
                    Ply:SetPos(ClimbSwep.Parent:LocalToWorld(ClimbSwep.LocalPos))
                    return

                end

            end

        end

[ERROR] addons/climb swep/lua/weapons/climb_swep2/shared.lua:501: Tried to use a NULL entity!
  1. Alive - [C]:-1
   2. fn - addons/climb swep/lua/weapons/climb_swep2/shared.lua:501
    3. unknown - addons/ulib/lua/ulib/shared/hook.lua:109