I cast Hallowed Moonlight to prevent Den of the Bugbear's goblin token from entering the battlefield, which was followed by an infinite amount of goblin token creation triggers, none of which entered the battlefield, but created an endless loop which crashed the game. The MTGO platform tried to run through the entire game leading up to that point but ran into the same error. Then I was unable to concede, or leave the match and re-queue.
