[5.x] Cannot load existing fields

[zsavajji]

Describe the bug

Hi, I noticed after creating some fields in a form that when i go load fields from the existing list it goes straight to error. This is maybe related to not having any more field to add except the ones in the current form.

The stacktrace goes as following: formie_error.log

In case of a brand new form, the error does not appear but I am unable to add any existing fields, with no apparent console logs or requests.

If I can I help with more cases or tests, please let me know.

Steps to reproduce

1. Create a form with some fields

2. Save

3. Try to add more existing fields

4. Error is produced

5. Create a form with some fields

6. Add another form and try to add some existing fields

7. No fields added

Form settings

• Multi-page form: No
• Submission Method: Unrelated, but AJAX
• Client-side Validation: Yes
• Custom Form Templates: Yes

Craft CMS version

5.0.5

Plugin version

3.0.0-beta.8

Multi-site?

Yes

Additional context

This happens on a development installation of Craft 5.0.0 that's being developed and updated as new versions become available.

[engram-design]

Fixed for the next release. To get this early, run composer require verbb/formie:"dev-craft-5 as 3.0.0-beta.8".

[engram-design]

Fixed in 3.0.0-beta.9