Werk #19762: User notification rules: Fix "User ID must not be None" error when saving rule

Component	Notifications
Title	User notification rules: Fix "User ID must not be None" error when saving rule
Date	Apr 28, 2026
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.6.0b1 Not yet released Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT 2.5.0p1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT 2.4.0p29 Not yet released Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT

Saving a user-specific notification rule from "Setup > Users > Notification rules of user" failed with an "User ID must not be None" error message. After saving, the action redirected back to the user notification rules overview without forwarding the affected user ID, so the target page could not determine which user it should display.

The user ID (and an active search query) are now preserved on the redirect after saving a user notification rule.

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