Attempted to index global 'msg' (a nil value) how do i fix?

permission = { "LimitedLogic", "Danglt","DevLogixx","name1","name2","name3","name4","name5" }
local prefix = ";"



function admincatted(msg, speaker)
	for i = 1,#permission do 
	if (string.upper(speaker.Name) == string.upper(permission[i])) then
		msg = msg:gsub("/e ", "")
		if msg:lower():sub(1, 5) == "part" ..prefix then

print("future command")

end

elseif msg:lower():sub(1,4) == "gui" ..prefix  then
					
print("yes")
				end
			end
		

print("future command 2")
				end

if msg:lower() == "prefix?" then
			game.Chat:Chat(speaker.Character, "The prefix is: '"..prefix.."'")
		elseif msg:lower():sub(1, 6) == "admin" ..prefix then
			local plr = msg:sub(7)
			game.Chat:Chat(speaker.Character, "Made "..plr.." A Admin")
			table.insert(permission, plr)
	end