Hey,
You should be able to drop and use your second teleporter stone. Once you're in Commander Ralph's room, hit the spacebar key to pause the game. Open up the inventory window. Quickly left click and drag the teleporter stone in the room to the inventory window. Pause the game again. Use the teleporter stone you've just picked up and teleport out. Make sure you have a back up save before doing this. Or if you really can't get your teleporter stones, you can try making new ones....
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