error 0 - Attempt to assign property "tags" on null

I updated the website to Joomla 4.3,3.
With Update extension I updated to the latest version of sermonspeaker.
This did not work, there was an error of a missing file autoload.php in map /administrator/components/com_sermonspeaker/ vendor 
I transfered this file from the intstall package. Everything works fine in the backend now, but not in the frontend.
There is an error and I can't figure out what is going on....

0 - Attempt to assign property "tags" on nullYou may not be able to visit this page because of:

1. an out-of-date bookmark/favourite
2. a search engine that has an out-of-date listing for this site
3. a mistyped address
4. you have no access to this page
5. The requested resource was not found.
6. An error has occurred while processing your request.

Please try one of the following pages:

• Home Page

If difficulties persist, please contact the website administrator and report the error below.Attempt to assign property "tags" on null
/home/u74460p72314/domains/kaleo.nl/public_html/mm4/components/com_sermonspeaker/views/sermons/view.html.php:48Call stack#FunctionLocation1()JROOT/components/com_sermonspeaker/views/sermons/view.html.php:482SermonspeakerViewSermons->display()JROOT/libraries/src/MVC/Controller/BaseController.php:6453Joomla\CMS\MVC\Controller\BaseController->display()JROOT/components/com_sermonspeaker/controller.php:1374SermonspeakerController->display()JROOT/libraries/src/MVC/Controller/BaseController.php:6785Joomla\CMS\MVC\Controller\BaseController->execute()JROOT/components/com_sermonspeaker/sermonspeaker.php:416require_once()JROOT/libraries/src/Dispatcher/LegacyComponentDispatcher.php:717Joomla\CMS\Dispatcher\LegacyComponentDispatcher::Joomla\CMS\Dispatcher\{closure}()JROOT/libraries/src/Dispatcher/LegacyComponentDispatcher.php:738Joomla\CMS\Dispatcher\LegacyComponentDispatcher->dispatch()JROOT/libraries/src/Component/ComponentHelper.php:3619Joomla\CMS\Component\ComponentHelper::renderComponent()JROOT/libraries/src/Application/SiteApplication.php:20810Joomla\CMS\Application\SiteApplication->dispatch()JROOT/libraries/src/Application/SiteApplication.php:24911Joomla\CMS\Application\SiteApplication->doExecute()JROOT/libraries/src/Application/CMSApplication.php:29312Joomla\CMS\Application\CMSApplication->execute()JROOT/includes/app.php:6113require_once()JROOT/index.php:32

Looks like the category that is supposed to be loaded is not valid.
Can you please check that the menuitem has a category selected and save the menuitem so it is stored for sure.
If that doesn't help, check the same for sermons, speakers and series.

Hi Thomas,
As usual a very quick response. I am very glad with it. Thank you very much!
The issue is solved.