CLAHE crashes on mono image

Siril version: 1.3.2-alpha-dev

Operating System: Windows 10/11

Description of the bug

Opening CLAHE dialog or using clahe command while a mono image is open crashes Siril. Both with 16bit and 32bit mono images.

Reproduction

Reproduction steps:

1. Load a mono image
2. Open CLAHE dialog or use clahe command

Expected result: CLAHE is applied (on preview if you opened the dialog)

Actual result: Siril crashes