Fatal PHP errors after WordPress 6.9 upgrade
Plugin throws PHP fatal errors and TypeErrors after the WordPress 6.9 upgrade, breaking the site.
Tier II · Emerging Problems that are still building up.
3 public reports · first reported 3 December 2025 · last reported 8 October 2026
What's going wrong
Site owners who upgraded to WordPress 6.9 with the SimplyBook.me plugin report fatal PHP errors and undefined variable errors, including a TypeError in trial expiration code and a missing variable reference.
AI-assisted: written with the help of AI from the reports. The idea report has the full summary.
In the idea report
- The full summary.
- The products the 3 reports are about, and how many came each month.
- Related problems.
No business has been found with this problem yet, so the report has no contacts. All sales are final — no refunds. Pricing.