Fatal error: Uncaught Magento\Framework\Exception\LocalizedException: Must be category model instance or its id. in /var/www/schmuckkontor/vendor/magento/module-catalog/Model/Layer.php:230
Stack trace:
#0 /var/www/schmuckkontor/lite/classes/Controller/Product.php(231): Magento\Catalog\Model\Layer->setCurrentCategory()
#1 /var/www/schmuckkontor/lite/classes/Controller.php(60): Controller_Product->categoryAction()
#2 /var/www/schmuckkontor/lite/classes/Controller/Product.php(10): Controller->dispatch()
#3 /var/www/schmuckkontor/lite/classes/MagentoLite.php(297): Controller_Product->dispatch()
#4 /var/www/schmuckkontor/lite/index.php(36): MagentoLite::run()
#5 /var/www/schmuckkontor/pub/index.php(29): include('/var/www/schmuc...')
#6 {main}
thrown in /var/www/schmuckkontor/vendor/magento/module-catalog/Model/Layer.php on line 230