Fix Cart Page Critical Error

I'm experiencing a critical error on my cart and checkout pages when using Stripe as a payment gateway. The error occurs when trying to access the cart page or checkout page.

Requirements:
- Expertise in resolving payment gateway issues, particularly with Stripe
- Strong knowledge of cart and checkout page functionalities
- Experience with debugging WordPress or relevant e-commerce platforms
- Ability to provide a quick turnaround

Please include relevant experience in your bid.