Fatal error: Uncaught Functional\Exceptions\InvalidArgumentException: Functional\group() expects parameter 1 to be array or instance of Traversable, integer given in /var/www/vhosts/druckerpatronenexpress.de/httpdocs/includes/vendor/lstrojny/functional-php/src/Functional/Exceptions/InvalidArgumentException.php:272 Stack trace: #0 /var/www/vhosts/druckerpatronenexpress.de/httpdocs/includes/vendor/lstrojny/functional-php/src/Functional/Exceptions/InvalidArgumentException.php(70): Functional\Exceptions\InvalidArgumentException::assertCollectionAlike() #1 /var/www/vhosts/druckerpatronenexpress.de/httpdocs/includes/vendor/lstrojny/functional-php/src/Functional/Group.php(26): Functional\Exceptions\InvalidArgumentException::assertCollection() #2 /var/www/vhosts/druckerpatronenexpress.de/httpdocs/includes/src/Link/LinkList.php(96): Functional\group() #3 /var/www/vhosts/druckerpatronenexpress.de/httpdocs/includes/src/Link/LinkGroup.php(139): JTL\Link\LinkList->createLinks() #4 /var/www/vhosts/druckerpatronenexpress.de/httpdocs/inc in /var/www/vhosts/druckerpatronenexpress.de/httpdocs/includes/vendor/lstrojny/functional-php/src/Functional/Exceptions/InvalidArgumentException.php on line 272