every time i remove or spawn it in it creates hundreds of errors trying to use a null entity, if fixed this mod will be perfect

If anyone here wants to use this on their server, run this in a file on garrysmod/lua/autorun/server

hook.Add("OnEntityCreated", "SimpleDoorFixTest", function(ent)
if string.Left(ent:GetClass(), 5) == "door " then
function ent:Use(a, c)
local delay = 0
ent:SetSolid(SOLID_NONE)
ent:SetMaterial("models/props_combine/stasisshield_sheet")
hook.Add("Think", "CurTimeDelay", function()
if CurTime() < delay then return end
if IsValid(ent) then
ent:SetSolid(SOLID_VPHYSICS)
ent:SetMaterial("")
end
end)
end
end
end)

That null entity thing can be fixed by checking the validity of whatever entity is being set solid

this gives me errors every time i spawn it the NULL entity error comes up please fix it.

It is indeed giving errors:
[Simple Doors] lua/entities/door 01/init.lua:32: Tried to use a NULL entity!
1. SetSolid - [C]:-1
2. v - lua/entities/door 01/init.lua:32
3. unknown - lua/autorun/hook_inspector.lua:229 (x355)
This was AFTER doing an admin cleanup BTW

Your mod is Great and causes no errors when you spawn it or delete it.

Your mod is terrible and causes millions of errors when you delete it.