Simple code acting weirdly, anyone encountered this before?

So I'm trying out scripts in a game, but this script that's supposed to print out a specific value, (berryID.Value) only works 50% of the time, even with no changes to the script (or any script) between testing. When it doesn't work, it outputs "playerStats is not a valid member of Player" even though it clearly is. Anyways, here's the script, hope someone can help:

`

game.Players.PlayerAdded:Connect(function(player)

local Be = player.playerStats.berryID

while true do
    wait(1)
    print(Be.Value)
end

end)`