Installing a new theme permanently deletes custom color palettes

kris.kotlarek · November 3, 2025, 6:10am

Thank you for reporting this bug. It was fixed in this PR:

github.com/discourse/discourse

FIX: Prevent deletion of custom color palettes when installing themes

main ← incorrectly-delete-custom-palettes

opened 04:57AM - 03 Nov 25 UTC

lis2

+18 -1

When installing a new theme, custom color palettes (with theme_id = nil) were be…ing incorrectly deleted. This occurred because the theme installation process called `update_theme_color_schemes` before the new theme was persisted to the database. Since the theme's ID was nil, the query `ColorScheme.unscoped.where(theme_id: nil)` would match ALL custom color schemes, causing them to be deleted during the cleanup phase. Bug introduced in this PR - https://github.com/discourse/discourse/pull/34722

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Installing a new theme permanently deletes custom color palettes

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