What Would Be the Purpose of Putting Balled Up Aluminum Foil in a Crock Pot When Cooking a Whole Chicken?

I just found this recipe and it says to put two balled up aluminum foil balls in the bottom of a crock pot while cooking a whole chicken. I was wondering what exactly the purpose of this is and if it is safe to leave like that all day?
Also I am looking for some great crock pot recipes too.

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