Greetings @jessica76!
Oh dear- that must have been scary when it broke! I’m sorry about your lost dish, but I do hope you are okay 
I’ve seen quite a few dishes crack or break under heat in my lifetime- and oftentimes the blame does indeed fall on the dish itself. @Berta shared a similar experience about using a glass dish that she thought was fire-safe, but it turned out otherwise 
But if you’re sure it wasn’t that, we can certainly look at magickal interpretations 
Like Megan, I’d love to know a bit more about the nature of the ritual (banishing? cleansing? protection? curse removal? etc?) if you’re willing to share. I’d also ask if the dish broke during the spell or afterwards.
Again, I hope you’re okay, Jessica! Blessed be!