[BUG REPORT] Required parameter missing or invalid: items

Retired Boards Appdev Functions

Topic summary

Multiple users are experiencing a critical cart functionality issue where customers cannot add products, triggering a 400 error with the message “Required parameter missing or invalid: items.”

Key Details:

  • The error appeared suddenly without any recent site changes
  • Affects all products across the shop
  • One user reports the issue started at 10:00 AM on their site (sengefabrikken.dk using Prestige theme)
  • Another user confirms the problem occurs “with any theme,” suggesting it may not be theme-specific

Current Status:

  • The discussion remains unresolved with no solution identified
  • Multiple affected users are seeking help and asking if others found fixes
  • No root cause has been determined yet
Summarized with AI on October 25. AI used: claude-sonnet-4-5-20250929.
1

We experience that our customers are unable to add products to their cart. When they try to add something, a 400 error occurs saying "

{"status":"bad_request","message":"Parameter Missing or Invalid","description":"Required parameter missing or invalid: items"}

The issue suddenly appeared today at 10:00 AM and occurs on all product in the shop. We haven’t made any changes to the site.
Anyone else experience this bug and have some ideer how to fix it.
We are using Prestige theme.

Our site is: https://www.sengefabrikken.dk/

2

How you resolve this problem? i have the same issue.
Thanks

3

Hello Kalhazan,

When did this bug first appear for you? What is your site?"

4

Hello, did you find the solution? It started happening to my site, and with any theme. Thkns