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if not tonumber(line) and not bAllLines then return end I've seen a similar function made like 2/3 years ago (can even tell you that some var names are equal), but yours seems better. Nice one Just a tip. if type(tonumber(line)) ~= "number" and not bAllLines then return end The tonumber() function tries to convert the arg into a number, if it can't do that, it'll return a nil value, so you can do this instead: if not tonumber(line) and not bAllLines then return end