Werk #22130: Fix crash in custom attribute filter without a value

Component

User interface

Title

Fix crash in custom attribute filter without a value

Date

Aug 17, 2026

Level

Trivial Change

Class

Bug Fix

Compatibility

Compatible - no manual interaction needed

Checkmk versions & editions

3.0.0b1 Not yet released	Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT
2.5.0p12 Not yet released	Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT
2.4.0p36 Not yet released	Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT

Opening a page that applies a Custom attribute filter -- for example combined graphs -- could fail with a crash report showing KeyError: 'service_custom_variable_value' or the host equivalent.

This happened when the stored filter kept the selected attribute but no value for it, which is possible for filters saved from older contexts. The filter now behaves exactly as it does when you leave the value field empty in the form: it matches any value of the selected attribute.

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