2005 Nissan Altima 2nd Time Happend To Me In 2 Days

Well the is the second time this has happened to me. I started the car and everything was fine. I turned to air conditioner on for about 5 mins once the car started since the car was in shade it cooled quickly. After the car cooled up I took the AC off and left the pressure on low with the air circulating. While I was doing that I was waiting for the light to change. When I went to go the car stalled and just shut off. I went to turn it on and it stalled. After 2 tries being stuck in the street it turned on but now the engine light is on. I went to get it check at autozone from there diagnostic computer and when it read it said it was the crankshaft sensor. Now I dont have a feeling its that. I would like to know what you guys would have to say. Thank you