Check for existing player

mybadnames/init.lua

@@ -17,6 +17,9 @@ for _, nm in pairs(bad_names) do
 
 minetest.register_on_prejoinplayer(function(name, ip)
 	local n = string.find(string.lower(name),nm)
+	local wp, err = io.open(minetest.get_worldpath().."/players/"..name, "r")
+	if wp then return end
+	wp:close()
 	if n ~= nil then
 		return "\nThe name .."..name.." is not allowed\n\nPlease pick a different Name."
 	end