503 Undefined array key "tt_content" on accessing be_groups backend on Typo3 v12 and Powermail EAP

Hello there,

Using Typo3 v12.4.2 and Powermail EAP 11.0.0 with composer we cannot access the backend groups editing form anymore due to the following error:

Core: Exception handler (WEB): Uncaught TYPO3 Exception: array_keys(): Argument #1 ($array) must be of type array, null given | TypeError thrown in file /var/www/vhosts/[ANONYMIZED_URL]/vendor/in2code/powermail/Classes/EventListener/FlexFormParsingModifyEventListener.php in line 78. Requested URL:[ANONYMIZED_URL]/typo3/record/edit?token=--AnonymizedToken--&edit%5Bbe_groups%5D%5B1%5D=edit

and

Core: Error handler (BE): PHP Warning: Undefined array key "tt_content" in /var/www/vhosts/[ANONYMIZED_URL]/vendor/in2code/powermail/Classes/EventListener/FlexFormParsingModifyEventListener.php line 78

The solution is pretty straight forward to implement in /vendor/in2code/powermail/Classes/EventListener/FlexFormParsingModifyEventListener.php, where the function getPidForCurrentRecord becomes:

    private function getPidForCurrentRecord(): int
    {
        $request = $this->getRequest();
        $queryParams = $request->getQueryParams();
        if (isset($queryParams['edit']['tt_content'])) {
            $uid = array_keys($queryParams['edit']['tt_content'])[0];
            return DatabaseUtility::getPidForRecord($uid, 'tt_content');
        } else if (isset($queryParams['edit']['be_groups'])) {
            $uid = array_keys($queryParams['edit']['be_groups'])[0];
            return DatabaseUtility::getPidForRecord($uid, 'be_groups');
        }
        return null;
    }

To put it into words, the solution was simply to replace tt_content with the according URL parameter which equals a table in the database if it's set rather than tt_content. In my case, be_groups.

I guess there might be other places affected too, not just be_groups. It will throw an Uncaught Typo3 Exception: Return value must be of type int, null returned when that happens.

I won't create a pull request because I'm sure it's bad PHP and also that something else is going wrong that is just on our end, but I figured I might post this so if anyone encounters the same error they know right away what to do.

in2code-de / powermail

503 Undefined array key "tt_content" on accessing be_groups backend on Typo3 v12 and Powermail EAP #886