Undefined property, controllerContext->getFlashMessageQueue()

[hausmaninger]

Hi,

I get the following Error in Typo3 12.4.38, when Editing an address in the FE and submitting:

Error handler (FE): PHP Warning: Undefined property: AFM\Registeraddress\Controller\AddressController::$controllerContext in /.../vendor/afm/registeraddress/Classes/Controller/AddressController.php line 351

This corresponds to

$flashMessageQueue = $this->controllerContext->getFlashMessageQueue();

I found this Deprecation:
https://docs.typo3.org/c/typo3/cms-core/main/en-us/Changelog/11.5/Deprecation-95139-ExtbaseControllerContext.html

I'm not much into extension programming, and not sure how to understand the Deprecation.
Is this something that should be fixed or do I need to check if something else is wrong in my configuration?

Regards,
Thomas