Crash (SIGSEGV) in _darkroom_ui_apply_style_activate_callback on macOS Sequoia 26.0.1 (v5.2.1)

Is there an existing issue for this?

• I checked and did not find my issue in the already reported ones

Describe the bug

Darktable crashes immediately with an EXC_BAD_ACCESS (SIGSEGV) error when attempting to apply a style/preset to an image within the Darkroom view. The crash appears to originate from the _darkroom_ui_apply_style_activate_callback function, suggesting an issue with handling style application via the UI.

Steps to reproduce

Launch darktable 5.2.1 on macOS Sequoia 26.0.1.
2. Import an image.
3. Double-click the image to open it in the Darkroom view.
4. Navigate to the "Styles" module on the right-hand panel.
5. Click on any available style/preset to apply it to the image(sometimes even if i don't apply some preset just click the "Style"module it will also lead to crush)

Expected behavior

The selected style should be applied to the image preview in the Darkroom view without causing the application to crash.

Logfile | Screenshot | Screencast

log.rtf

Commit

No response

Where did you obtain darktable from?

darktable.org / GitHub release

darktable version

darktable 5.2.1

What OS are you using?

Mac

What is the version of your OS?

MacOS 26.0.1 Tahoe

Describe your system

No response

Are you using OpenCL GPU in darktable?

Yes

If yes, what is the GPU card and driver?

M1pro,16GB

Please provide additional context if applicable. You can attach files too, but might need to rename to .txt or .zip

No response

Start by reviewing the attached log.rtf and reproducing the crash in darktable 5.2.1 on macOS 26.0.1 with an imported image in Darkroom. Trace _darkroom_ui_apply_style_activate_callback while opening the Styles module and applying a style. Done means the Styles module and style application no longer crash the application.