Error in user YAML: (<unknown>): found character that cannot start any token while scanning for the next token at line 5 column 16

---
title: Fixing add product by number
issue: NEXT-30079
author: Simon Fiebranz
author_email: [email protected]
author_github: @CR0YD
---

Storefront

Changed method addProductByNumber in src/Storefront/Controller/CartLineItemController to include only products without variants and product variants