Why am I getting this error for my custom commands script?

When I tested out this script for custom commands I got an error, the error is: "userID is not a valid member of Player". How would I fix this and make the commands work?

function onChatted(msg, speaker)
    local source = string.lower(speaker.Name)
    msg = string.lower(msg)
    if msg == "!respawn" then
        speaker:LoadCharacter()
    elseif msg == "!sparkles" then
        Instance.new("Sparkles", speaker.Character.HumanoidRootPart)
    elseif msg == "!ff" then
        Instance.new("ForceField", speaker.Character)
    elseif msg == "!run" then
        speaker.Character.Humanoid.WalkSpeed = 25
    elseif msg == "!walk" then
        speaker.Character.Humanoid.WalkSpeed = 16
    elseif msg == "!sit" then
        speaker.Character.Humanoid.Sit = true
    end
end

game.Players.PlayerAdded:connect(function(player)
    if game:GetService("MarketplaceService"):UserOwnsGamePassAsync(player.userID, 5087872) then
    player.Chatted:connect(function(msg) onChatted(msg, player) end)
    end
end)