Enterprise rental window cracked

I am in a rental (other insurance paying for it). The small vent window cracked due to a rock hitting it. Should I get it repaired prior to returning the vehicle? I declined the damage through the rental Company. I have the damage coverage through my credit card but as I am in the rental due at a fault of not my own I am not paying for the rental so it is not eligible. Please advise on best solution. Additionally, the employee and I did not do a walk-through when I got the vehicle.