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Cannot read properties of undefined (reading 'length') #19073

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alexanoid opened this issue Mar 29, 2024 · 2 comments · Fixed by #19098
Closed

Cannot read properties of undefined (reading 'length') #19073

alexanoid opened this issue Mar 29, 2024 · 2 comments · Fixed by #19098
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@caalador
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investigation prerelease version for Vaadin 24.4.0 Released with Vaadin 24.4.0.alpha21

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@alexanoid
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Description of the bug

One of my user reported the following error:

undefined_error

I'm unable to reproduce it personally.

Could you please tell me what it could be?

Expected behavior

no errors

Minimal reproducible example

n/a

Versions

  • Vaadin / Flow version: 24.4.0.alpha18
  • Java version: 17
@caalador
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caalador commented Apr 4, 2024

This would seem to be from a call in event listener handling getting an undefined for a specified type.
This should be a random failure and I'll add a fix that at least this case doesn't happen, but if there comes any more information on how it happens it would be good to know.

@caalador caalador self-assigned this Apr 4, 2024
caalador added a commit that referenced this issue Apr 4, 2024
@caalador
fix: return empty list
672c510 
Return an empty list if no
listeners for type exist.

Fixes #19073
@caalador caalador mentioned this issue Apr 4, 2024
Merged
caalador added a commit that referenced this issue Apr 4, 2024
@caalador
fix: return empty list (#19098)
73ddf02 
Return an empty list if no
listeners for type exist.

Fixes #19073
@vaadin-bot
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This ticket/PR has been released with Vaadin 24.4.0.alpha21 and is also targeting the upcoming stable 24.4.0 version.

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@caalador caalador

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investigation prerelease version for Vaadin 24.4.0 Released with Vaadin 24.4.0.alpha21
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Vaadin Flow bugs & maintenance (Vaadin 10+)
Status: ✅ Closed
Vaadin Flow ongoing work (Vaadin 10+)
Status: Done
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fix: return empty list vaadin/flow
4 participants
@caalador @vaadin-bot @mshabarov @alexanoid