For some reason when ever I chat I die, any ideas?

I'm currently making a custom admin script and it was all going well until I realised that everything I said killed me. This is my script:

local Admins = {"robloxianmirror", "Player", "Player1"}
local Prefix = "#"
local Banned = {"Bad_Guy123"}

--[[
	"Me" isn't implemented yet however "[Prefix]kill all" will work
	
	Current commands:
		Manual Ban Via script
		shutdown - Shutsdown the server
		kill - Kills a player
		damage - Takes of 10% of a player's health
--]]

game.Players.PlayerAdded:connect(function(Player) -- Bans
	for l, a in pairs(Banned) do
		if Player.Name == Banned[l] then
			Player:Kick("You are banned from this game.")
		end
	end
end)

game.Players.PlayerAdded:connect(function(Player) -- Check for Admin
	for i, v in pairs (Admins) do
		if Player.name == Admins[i] then
			local Location = Player.PlayerGui
			local Gui = script.ScreenGui:Clone()
			Gui.Parent = Location
			Gui.Frame.Text.Text = "Welcome " .. Player.Name .. ", you are an admin!"
			Gui.Frame:TweenPosition(UDim2.new(0.333, 0 ,0 ,0), "In", "Quad", 0.75)
			wait(3)
			Gui.Frame:TweenPosition(UDim2.new(1.2, 0, 0, 0), "Out", "Quad", 0.75)
			wait(0.75)
			Gui:Remove()
			Player.Chatted:connect(function(msg)
				if msg == Prefix .. "kill all" or Prefix .. "reset all" then
					local Players = game.Players:GetPlayers()
					for i, v in pairs (Players) do
						Players[i].Character.Head:Remove()
					end
				end
				if string.sub(msg, 1, string.len(Prefix .. "kill ")) == Prefix .. "kill " then
					local info = string.sub(msg, string.len(Prefix .. "kill "))
					if game.Workspace:FindFirstChild(info) ~= nil then
						local Victim = game.Workspace:FindFirstChild(info)
						Victim.Head:Remove()
					end
				end
				if string.sub(msg, 1, string.len(Prefix .. "reset ")) == Prefix .. "reset " then
					local info = string.sub(msg, string.len(Prefix .. "reset "))
					if game.Workspace:FindFirstChild(info) ~= nil then
						local Victim1 = game.Workspace:FindFirstChild(info)
						Victim1.Head:Remove()
					end
				end
				if msg == Prefix .. "shutdown" then
					game.Players:ClearAllChildren()
					game.Workspace:ClearAllChildren()
				end
				if string.sub(msg, 1, string.len(Prefix .. "damage ")) == Prefix .. "damage " then
					local info = string.sub(msg, string.len(Prefix .. "damage "))
					if game.Workspace:FindFirstChild(info) ~= nil then
						local Victim2 = game.Workspace:FindFirstChild(info)
						Victim2.Humanoid.Health = Victim2.Humanoid.Health + 10
					end
				end
			end)
		end
	end
end)

Friend Me On Roblox And We Can Work Out Together About This Lua Problem