Cart error: No valid ID or line parameter

Functions
1

I have encountered an issue where adjusting the units at a cart level often triggers an error with No valid ID or line parameter. See Your Shopping Cart – Max

Upon contacting Shopify support center, was referred here as well as provided this internal doc in relation to a similar matter - Fix “Parameter Missing or Invalid” errors

If a solution could please be provided so we can get this fixed asap that would be great.

2

Hi @Rosie_Max

Have you already tried these troubleshooting steps:

  • You might have badly-formed HTML in your customized template. You can check your HTML by submitting your code to the W3C Validator.
  • You might have tried to hide the default option for a product that has only one variant by removing the dropdown menu or single radio button. You must replace whatever you have removed with a hidden field that will pass the variant ID of the first variant to Shopify.
  • You might use radio buttons for product variants in your customized theme, but there is no button checked by default. You have to select the first radio button in your HTML using selected="selected". If your customer does not select a variant, and there is no variant selected by default, no variant ID is submitted with the form.

Also - what theme are you using and have you made any code edits to it?