TypeError: Cannot read properties of undefined (reading 'length') after upgrade to 4.20.3

[vsamofal]

Bug report

Required System information

STRAPI_ENFORCE_SOURCEMAPS=true in your .env --> (sorry I tried it, but it's not working)

• Node.js version: v18.14.2
• NPM version: 9.5.0
• Strapi version: 4.20.3
• Database: postgres
• Operating system: darwin-arm64
• Is your project Javascript or Typescript: js

Describe the bug

After to upgrade to latest version, frontend is failing with exception on reading a length property, on one particular collection, and lead to white screen in both dev and prod modes. Refreshing the page helps, and it loading entity and allows me to add/edit and do everything that I want. But once I go to another collection and moving back to this entity - white screen again. Refresh and it's working just fine.

If I'm switching menu and getting back to content manager, I can open this page fine, so the problem appears only when I'm switching between collections.

If I'm switching to single types, I can back to collection just fine as well. So again the problem appears only

Expected behavior

Switching between collections should work fine

Code snippets

Sorry for this... but I can't make source map works

main.0f63a8e2.js:805 TypeError: Cannot read properties of undefined (reading 'length')

Error happens here, f is undefined

field definition

  "faq": {
      "displayName": "faq",
      "type": "component",
      "repeatable": true,
      "component": "general.faq"
    }

but when I'm refreshing the page, this field is there, seems like some async processing happen:

hopefully it helpful and enough, if not let me know what else to share

[philipschikora]

I am experiencing the same issue

[brechtpallemans]

Same issue here, I'm on version 4.20.2

[philipschikora]

Affects version 4.20.1 also

[magikarp28]

Same issue here, on 4.20.5

[coderdix24]

same issue

[vsamofal]

4.21.0 still here

[vsamofal]

Found that it happen also with a backend error, where limit passed to the query is undefined

[philipschikora]

That is no option for me

[dennism501]

Internal TID: 6529

[alexandrebodin]

Hello,

@vsamofal can you share what version you were upgrading from so we can try to reproduce ? we can't reproduce by just using the v4.20.x version as of now.

Something you can test (locally at 1st and with non important data ⚠️) is to clear the plugin_content_manager_xxx keys in your strapi_core_store_settings table to see if it's a data inconsistency.

Also this might have been fixed in more recent version of Strapi, have you tried upgrading to latest since then ?

[Bobivankenobi]

@alexandrebodin I'm facing this error with the latest version of Strapi, 4.23.1. I'm also happy to jump on a call with you to replicate the bug successfully. I think the issue is related to the use of a repeatable component in a certain context. The last version in which this bug does not occur is 4.16.2.

bug1.mp4

[Bobivankenobi]

@alexandrebodin Question collection type.

[vsamofal]

I was on 4.16.1, and quite a similar situation as @Bobivankenobi has, I do have a repeatable component in my collection type as well

[alexandrebodin]

Thanks for the details 🙌 I'll dig into it later today

[alexandrebodin]

ℹ️ The fix will be released tomorrow :)

[Bobivankenobi]

ℹ️ The fix will be released tomorrow :)

Awesome @alexandrebodin Thank you.