Why does my auto equip tool script only work sometimes?

I've created a script that auto equips an item, it works most of the time but sometimes it glitches and doesn't work? Did I do something wrong?

local ServerStorage = game:GetService("ServerStorage")
local plrs = {}

repeat wait(1) until game.Players.NumPlayers >= 1

for i, player in pairs(game.Players:GetPlayers()) do
	if player then
		table.insert(plrs,player)
	end
end

wait(2)

for i, player in pairs(plrs) do
	if player then
		character = player.Character

		if character then
			local Frostgore = ServerStorage["Arm"]:Clone()
			Frostgore.Parent = player.Backpack
			wait()
			character.Humanoid:EquipTool(Frostgore)
			wait(0.5)

		else
			if not player then
				table.remove(plrs, i)
			end

		end
	end
end