The empty party glitch is a glitch in Final Fantasy VI that occurs when the player ends up having no members in their party, thus locking up and freezing the game. This can be only done during the time Terra flies off from Narshe after the battle with Kefka. If the player takes a party of only Gau, then heads to Kohlingen and recruits Shadow, then walks all the way to the Veldt, has Gau use Leap on an enemy, then returns to Narshe with only Shadow, he will leave the party even though he is the only party member. This will lock up the game and leave the player unable to do anything. There is a bugfix patch that players can use to fix this on the SNES version (it is listed as "Shadow Leaves One-Man Party event bugfix" on that page).