Unable to schedule reports using "On the" function

[gdm-maha]

Describe the bug

When scheduling a report to be sent automatically, using recurrance monthly and then pressing the "On the" button i get "Bad Request: Your browser sent a request that this server could not understand."

To Reproduce

1. Create a report
2. Create a schedule
3. Use "frequency: Custom" and "Custom frequency: Monthly"
4. Then press the "On the" Radio button

Expected behavior

Able to use the On the button then choose for example "first monday"

Screenshots

Your Environment

• Module version: 1.0.5
• Dependent module versions:
  pdfexport: 0.12.0
  icinga-php-thirdparty.noarch: 0.15.2-1.el9
  icinga-php-library.noarch: 0.19.1-1.el9
• Icinga Web 2 version and modules (System - About):

* Web browser and version: Edge 146.0.3856.62 * Icinga 2 version used (`icinga2 --version`): r2.15.2-1 * PHP version used (`php --version`): PHP 8.3.19 (cli) (built: Mar 12 2025 13:10:27) (NTS gcc x86_64) * Server operating system and version: Rocky Linux 9.6

Additional context

Asked claude to fix this which did work in my test/dev env. However i am not a programmer so i wont use the fix in prod. But the info it found might be usefull for yall, attached an MD file of a writeup :)

claude_fix.md

[nilmerg]

Hi,

Claude identified the problem correctly. Though, the fix needed to be done in our library: Icinga/ipl-html#196

The upcoming version of icinga-php-library will include the fix. You may of course apply the patch manually in the meantime.