Wix Stores: Code fine but getting Internal Server Error

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Although, I’ve with the number of product page customization & going well. But implementing the new one today & getting this issue. I’m not sure about this issue. Can anyone let me know reason for this error?

Error:

createConsoleProxy.ts:47 FetchError: {"message":"Cannot read properties of null (reading 'cartId')","locations":[{"line":3,"column":5}],"path":["cart","addToCart"],"extensions":{"code":"INTERNAL_SERVER_ERROR","exception":{"name":"ERROR:addToCart:RESOLVER_ERROR"}}}

Product Data to Add to Cart

[
    {
        "productId": "ffc5faa7-***-0fe",
        "quantity": 1,
        "options": {
            "choices": {
                "Voucher type*": "Premium gift box",
                "Variant*": "Iconic Tour"
            },
            "customTextFields": [
                {
                    "title": "Recipient",
                    "value": "DDD"
                },
                {
                    "title": "Text",
                    "value": "HHH"
                }]
        }
    }
]

Thanks in advance!

Regards,
Rajjat Garg