What would cause a crockpots lid to break?

I was cooking some meat in the crockpot that i have, its nothing special, and after the alloted time, i came in to check on it, and the entire glass lid had shattered. There was glass everywhere.. the food, some of it was on the counter.. everywhere! I dont think it exploded because the lid was still intact on... show more I was cooking some meat in the crockpot that i have, its nothing special, and after the alloted time, i came in to check on it, and the entire glass lid had shattered.
There was glass everywhere.. the food, some of it was on the counter.. everywhere!
I dont think it exploded because the lid was still intact on the top, but... what would cause this? Does anyone have ANY ideas?!
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