kungpowee / Legend-of-zelda-orcarina-of-time-freeze

ok what had happened was that i went to the happy mask shop in normal orcarina of time nott master quest k so i bought the keaton mask for the guard at death mountain so as soon as i left i put the mask on like 2/3 seconds after link walked out the door and the word market was barely fading in and i put the mask on but then for some reason the game froze on me but i stilll kept playing music so then i thought it was just my tablet actin up so i charged it and went to sleep so the i woke up and went to mupen 64 again back to legend of zelda and then loaded my save and then it was just a black screen but still playing the same music pleaase help loz is my fave game