WP 7.0 update broke FluentBooking on my site. It's throwing a critical error.
Here is some guidance which might point you in the right direction?
Found it: FluentBooking Pro fatal error in PHP logs:
[21-May-2026 15:47:44 UTC] PHP Fatal error: Uncaught ArgumentCountError: Too few arguments to function {closure}(), 1 passed in /home/pifster/htdocs/www.pifster.org/wp-includes/class-wp-hook.php on line 341 and exactly 2 expected in /home/pifster/htdocs/www.pifster.org/wp-content/plugins/fluent-booking-pro/boot/app.php:49Root cause: WordPress 7.0 changed the hook system (apply_filters() signature), and FluentBooking Pro's closure expects 2 arguments but only receives 1.
Impact: FluentBooking Pro admin interface crashes with fatal error.
This is the same issue affecting all Fluent plugins:
- FluentCart (admin interface broken, wp.hooks undefined)
- FluentCRM (CSS 404)
- FluentBooking Pro (PHP fatal error in hook system)
Solution: Wait for Fluent vendor to release WordPress 7.0 compatible updates. All three plugins have the same root cause - WordPress 7.0 changed core APIs that the Fluent plugins depend on.
It's working perfectly on my site
Ryk Melck Same here
We couldn't reproduce the issue from our side. Could you please create a support ticket?
Raiyan Marzan I did. When I enable the plugin, it crashes my site.
Chris Conlee I think I found the issue. I will investigate more and fix it.
Shahjahan Jewel Thank you. Waiting to hear.
anything X.0 with wordpress is a hard pass for me been there done that. Wait and see what the next version fixes lol
Update. I believe it's only the Pro component that is crashing. If I disable Pro the dashboard loads and the site will continue to work.
Chris Conlee thats odd because I have the pro. The backend is not crashing.
I tested WP7.0 briefly on staging, and experienced no visible issue with any of the latest fluent plugins. Still waiting for a point release to upgrade production, once most of the bugs will be fixed…