fix undefined glyph getting id

[farhoudi]

i'm not js developer but i'm getting this error when i try to create bunch of pdfs from our tauri application. it happens only on a few items, not all. but this change fixes that.

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Latest commit: 4e0c678f2998967d8602d8fb0ec67029fcb5a4e7

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[wildseansy]

I also started seeing this issue today with my project. Please merge this fix soon!

[diegomura]

Can you provide a way to reproduce it to understand why it's returning undefined here?