Gameserver.ashx error?

Bug Reports Engine Bugs
#1

Whenever I start up a server on studio and one of the player’s leave it gives this error:

12:57:06.355 - An error occurred
12:57:06.355 - Script ‘http://www.roblox.com/game/gameserver.ashx’, Line 118
12:57:06.355 - Stack End

Not sure if its just because of my network but this happens even in an empty baseplate place.

#2 
game:GetService("Players").PlayerRemoving:connect(function(player)
	print("Player " .. player.userId .. " leaving")	

	local isTeleportingOut = "False"
	if player.Teleported then isTeleportingOut = "True" end

	if assetGameUrl and access and placeId and player and player.userId then
		game:HttpGet(assetGameUrl .. "/Game/ClientPresence.ashx?action=disconnect&PlaceID=" .. placeId .. "&UserID=" .. player.userId .. "&IsTeleport=" .. isTeleportingOut)
	end
end)

Line 118 is this one:

if player.Teleported then isTeleportingOut = "True" end

API Dump of Player.Teleported:

Property bool Player.Teleported [hidden] [readonly] [RobloxScriptSecurity]

The error is typically for accessing a member you should not be able to access.
The GameServer.ashx is able to access Player.Teleported though, so yeah… no idea what happened.
(It is as if the new thread created by PlayerRemoving changed identity)