I need some help with the code!

[Baton TWIX]

Hello everybody!

I found this addon on the steam workshop, here is the whole code:

-- Freezes all Props!
function FreezeIt( ply )

   if ply:IsAdmin() then
        print("All Props has been frozen by: " .. ply:Nick())
    else
        return false
   end
   
   local frprops = 0

    for k,v in pairs(ents.GetAll()) do
        if v:GetClass() == "prop_physics" then
           local PhysObj = v:GetPhysicsObject()
           PhysObj:EnableMotion(false)
		   frprops = frprops + 1
        end
    end

    for k,v in pairs(player.GetAll()) do
        v:ChatPrint(frprops .. " prop's has been frozen!")
    end

end
concommand.Add( "FA", FreezeIt )

And when I type FA its returning an error:

[ERROR] addons/anti propkill & freeze all props/lua/autorun/antilag.lua:15: Tried to use invalid object (type IPhysicsObject) (Object was NULL or not of the right type)
  1. EnableMotion - [C]:-1
   2. unknown - addons/anti propkill & freeze all props/lua/autorun/antilag.lua:15
    3. unknown - lua/includes/modules/concommand.lua:69

Could someone please help me with fixing it?

[Jeezy]

You can just check if the physics object is valid before trying to freeze it.
Although that'd just be covering up the real problem. Maybe try to print out the model name before attempting to freeze it, so you might have a better idea of what you're missing.