TYPO3 Core

After the successful upgrade to 8.7.18 using wizard in the install-tool, no content is displayed.
see http://www.ACTARON.com

The following error entry in /typo3temp/var/logs/typo3.log

Mon, 30 Jul 2018 22:32:27 +0200 [WARNING] request = "21170940a2ca0" component = "TYPO3.CMS.Core.Utility.ExtensionManagementUtility": TYPO3 \ CMS \ Core \ Category \ CategoryRegistry: no category registered for table " sys_file_metadata ". Key what already registered.
Mon, 30 Jul 2018 22:32:27 +0200 [WARNING] request = "21170940a2ca0" component = "TYPO3.CMS.Core.Utility.ExtensionManagementUtility": TYPO3 \ CMS \ Core \ Category \ CategoryRegistry: no category registered for table " tt_content ". Key what already registered.

I also tried to manually convert content to text & media (css vs fluid) - without success

Currently, css_styled_content and fluid_styled_content are active.

Main system information:
Operating system: Unix
PHP version: 7.1.17-he.0
PHP CGI detected: No
Database connection 'Default'
Version: MySQL 5.6.38
Tables: 70

Many Thanks!

m.
This issue was automatically created from https://github.com/TYPO3/TYPO3.CMS/pull/122