fix for "UNABLE TO OPEN CART AFTER ADDING EXISTING CART ITEM AGAIN. #9"

[YanaKrukovets]

Hello,

This is my fix of issue#9 "UNABLE TO OPEN CART AFTER ADDING EXISTING CART ITEM AGAIN. #9" Link to the issue https://github.com/adrianhajdin/ecommerce_sanity_stripe/issues/9

Thanks

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[rockyessel]

Hello, can you please explain your code, i really finding it difficult to understand, I'm 4 months old in all this please.🙏🙏🙏🙏

[imueLx]

Thank you, it's working