# G4: Adding Unicode to a glyph with a saved custom category triggers sidebar errors

**URL:** <https://forum.glyphsapp.com/t/g4-adding-unicode-to-a-glyph-with-a-saved-custom-category-triggers-sidebar-errors/37193>\
**Category:** Glyphs\
**Tags:** bug\
**Created:** [September 3, 2026, 12:36am UTC](https://forum.glyphsapp.com/t/g4-adding-unicode-to-a-glyph-with-a-saved-custom-category-triggers-sidebar-errors/37193 "2026-09-03T00:36:57Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![sugarfree](https://forum.glyphsapp.com/letter_avatar_proxy/v4/letter/s/57b2e6/32.png) [@sugarfree](https://forum.glyphsapp.com/u/sugarfree)\
**Post date:** [September 3, 2026, 12:36am UTC](https://forum.glyphsapp.com/t/g4-adding-unicode-to-a-glyph-with-a-saved-custom-category-triggers-sidebar-errors/37193/1 "2026-09-03T00:36:57Z")

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Glyphs 4.1 (4102)

**Steps to reproduce**

1. Open the attached `Glyphs4-Custom-Category-Unicode-Repro.glyphs`.

2. Select `newGlyph`.

3. Enter a Unicode value, such as `F400`.

4. Press Return or click elsewhere.

**Result**

Glyphs displays a sequence of “Invalid filter in sidebar” alerts for several built-in category and subcategory filters. The Unicode is assigned after dismissing the alerts.

The problem appears after a glyph with a custom category has been saved and the file reopened. Creating and editing the same glyph before reopening the file does not appear to trigger it.

[Glyphs4-Custom-Category-Unicode-Repro.glyphs](https://forum.glyphsapp.com/uploads/short-url/naJKhmDT2kNfKsawtp1gzjpnnKS.glyphs) (8.4 KB)

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<div class="post-metadata">

**Author:** ![GeorgSeifert](https://forum.glyphsapp.com/user_avatar/forum.glyphsapp.com/georgseifert/32/259_2.png) [@GeorgSeifert](https://forum.glyphsapp.com/u/GeorgSeifert)\
**Post date:** [September 3, 2026, 9:11am UTC](https://forum.glyphsapp.com/t/g4-adding-unicode-to-a-glyph-with-a-saved-custom-category-triggers-sidebar-errors/37193/2 "2026-09-03T09:11:24Z")

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Many thanks for the reproducible test case. I was after this for some time … Fixed it.

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<div class="post-metadata">

**Author:** ![sugarfree](https://forum.glyphsapp.com/letter_avatar_proxy/v4/letter/s/57b2e6/32.png) [@sugarfree](https://forum.glyphsapp.com/u/sugarfree)\
**Post date:** [September 3, 2026, 5:03pm UTC](https://forum.glyphsapp.com/t/g4-adding-unicode-to-a-glyph-with-a-saved-custom-category-triggers-sidebar-errors/37193/3 "2026-09-03T17:03:06Z")

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Thanks so much.