Why does my if statement call other things a script? [SOLVED]

In my code, there's a function. In that, there's an if statement that sees if the object is a script. When it sees something other than a script, it calls it a script, which continues with the script and causes an error. Can anyone fix this? Thanks in advance!
I used "IsA" already and "ClassName" string. They both didn't work. The code below is all I'll provide

local function Scan(a)
if a.ClassName == "Script" or "LocalScript" then -- problem

EDIT: I just figured it out myself. If you're experiencing this problem, here is the code:

local function Random(a)
	local success,data = pcall(function()
		if a.Source then
			Scan(a)
		end
	end)
end
local function Scan(a)
--Here you can proceed the code. Of course you can use the pcall here

As your code stands, it compares the ClassName of a to "Script". If this was false it will look at the or logical operator and see that "LocalScript" (Which is a string) is true. This is because in Lua, values that are not nil or false are evaluated as being truthy.

Your code basically says:

if a.ClassName == "Script" or true then

end

The if-statement always passes since the or sees that the next thing is true. We need to compare the string to ClassName again to fix this.

if a.ClassName == "Script" or a.ClassName == "LocalScript" then

end

Let me know if I explained that right for you to get. Maybe someone else will correct me if I did miss anything.