[WARNING] Flexform default item array missing

[schlomania]

Depending on the settings regarding PHP error messages, a warning is displayed when opening a backend user group:
Core: Error handler (BE): PHP Warning: foreach() argument must be of type array|object, string given in [..]vendor/typo3/cms-core/Classes/Migrations/TcaMigration.php line 1411

To prevent this, a corresponding "array" should be set by default in the "FlexForms" for fields with <items type="array">:

<numIndex index="0" type="array">
<numIndex index="0"></numIndex>
<numIndex index="1">0</numIndex>
</numIndex>

[schlomania]

System: TYPO3 12.4 + PHP 8.2, Debug-Context

[mschwemer]

Can you point me to the file / line, which causes the issue?

All flexforms are configured in the proposed way.

Which powermail version do you use?

[schlomania]

Current used version of Powermail is 12.5.1:

Related files:
Configuration/FlexForms/FlexformPi1.xml: Line 16
Configuration/FlexForms/FlexformPi2.xml: Line 55
Configuration/FlexForms/FlexformPi2.xml: Line 118
Configuration/FlexForms/FlexformPi2.xml: Line 212

[schlomania]

$GLOBALS['TYPO3_CONF_VARS']['SYS']['exceptionalErrors'] => 20480