attempt to index local 'char' (a nil value)?

mob = script.Parent.Parent
hum = script.Parent.Parent:WaitForChild("Humanoid")
torso = script.Parent.Parent:WaitForChild("UpperTorso")
runAnim = hum:WaitForChild("RunAnim")
anim = hum:LoadAnimation(runAnim)
stayOnTarget = nil
maxRange = 50
findRange = 30

function attack(attacker)
	
	repeat
		wait()
		local attackPos = attacker.HumanoidRootPart.Position
		local distance = (attackPos - torso.Position).magnitude
		
		if distance <= maxRange then
			hum.WalkToPoint = attackPos
		else
			stayOnTarget = nil
			break
		end
	until false
end

while wait() do
	for index, player in pairs(game.Players:GetPlayers()) do
		print(player.Character)
		local char = player.Character --goes wrong here
		print(player.Character)
		local Distance = (torso.Position - char.HumanoidRootPart.Position).magnitude
		
		if Distance <= findRange then
			attacker = player.Character
			attack(attacker)
		end
	end
end

I tried player.Character or player.CharacterAdded:wait() but that doesn't change a thing, it only changes the error enough for me to know that I can't get the character? error: attempt to index local 'char' (a nil value)