Why will my door not set CanCollide to false and what is this error?

The error:

  23:05:46.807 - Players.MinecraftButterfly87.PlayerGui.StaffDoorScript:23: attempt to index nil with 'PlayerHasPass'

The LocalScript inside StarterGui:

game.Players.PlayerAdded:Connect(function(player)
	if game.MarketplaceService:PlayerOwnsAsset(player,9304750) then
		game.Workspace.Backdrop.Obby.VIP.CanCollide = false
	end
end)

What should I do to fix this error and make the door's CanCollide property be false for players who own the VIP gamepass?

You should be using UserOwnsGamePassAsync() when using game passes. Here try this:

game.Players.PlayerAdded:Connect(function(player)
    if game:GetService("MarketplaceService"):UserOwnsGamePassAsync(player.UserId, 9304750) then
        workspace.Backdrop.Obby.VIP.CanCollide = false
    end
end)

Read about UserOwnsGamePassAsync() here. If this helped, be sure to accept this answer!

You're supposed to use :UserOwnsGamePassAsync. Also, don't use the PlayerAdded event since LocalScripts are automatically parented to every player when they are added. Try this:

repeat wait() until game:GetService("Players").Character

if game:GetService("MarketplaceService"):UserOwnsGamePassAsync (game:GetService("Players").LocalPlayer.UserId, 9304750) then
	game.Workspace.Backdrop.Obby.VIP.CanCollide = false
end