# Codebook for iOS 5.3.9 - Crash Fix Invalidate Assertion

**URL:** <https://discuss.zetetic.net/t/codebook-for-ios-5-3-9-crash-fix-invalidate-assertion/7262>\
**Category:** Updates\
**Created:** [September 22, 2026, 5:10pm UTC](https://discuss.zetetic.net/t/codebook-for-ios-5-3-9-crash-fix-invalidate-assertion/7262 "2026-09-22T17:10:15Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![mmoore](https://sea2.discourse-cdn.com/flex016/user_avatar/discuss.zetetic.net/mmoore/32/858_2.png) [@mmoore](https://discuss.zetetic.net/u/mmoore)\
**Post date:** [September 22, 2026, 5:10pm UTC](https://discuss.zetetic.net/t/codebook-for-ios-5-3-9-crash-fix-invalidate-assertion/7262/1 "2026-09-22T17:10:15Z")

</div>

Codebook for iOS 5.3.9 [now available](https://www.zetetic.net/codebook/documentation/latest-version/?platform=ios)

This is a maintenance release which includes a fix for a crash when attempting to access the Search View within Codebook on iOS 27 devices.

“Tried to invalidate an assertion that is already invalid”

## Changes in this version:

- Fixes “Tried to invalidate an assertion that is already invalid” crash when viewing search entries