this is clearly not my day, now after messing around with template I can't access Theme & Logo page anymore and I see following error that prevents me from switching to a different theme:
An exception has been thrown during the rendering of a template ("Parameter "themeName" for route "admin_themes_enable" must match "[a-zA-Z0-9_.-]+" ("" given) to generate a corresponding URL.").
any idea how to fix it or manually switch theme[ etc from phpmyadmin?