I saw another comment posted earlier onwards. They explained it better, but in short you need to go to the games audio files in "www", then go to BGM,
About 1/3rd into the list are two audio files called "El Infausto Ladron de Joyas" both A and B need to be changed. All you need to do is change the letter "o" in Ladron to an "ó"
once the edit is done it should stop the bug from appearing. I haven't tried it after the bug happend since I deleted the save file, but after doing that edit it never came up again. Hope this helps.