Fatal error: Uncaught TypeError: method_exists(): Argument #1 ($object_or_class) must be of type object|string, true given in /var/www/html/model/Concept.php:663 Stack trace: #0 /var/www/html/model/Concept.php(663): method_exists() #1 /var/www/html/model/Concept.php(645): Concept->removeDuplicatePropertyValues() #2 /var/www/html/vendor/twig/twig/src/Extension/CoreExtension.php(1567): Concept->getProperties() #3 /tmp/skosmos-template-cache/11/119c792ea93999dcf88ae6957eeee9db.php(400): twig_get_attribute() #4 /var/www/html/vendor/twig/twig/src/Template.php(405): __TwigTemplate_de6c7e13e910b6ba7653a9f6e83bdfee->doDisplay() #5 /var/www/html/vendor/twig/twig/src/Template.php(378): Twig\Template->displayWithErrorHandling() #6 /tmp/skosmos-template-cache/33/335961aeb615ac90d2d5e04aef7b22fb.php(75): Twig\Template->display() #7 /var/www/html/vendor/twig/twig/src/Template.php(182): __TwigTemplate_72da8b1f626220da62757349c4313b3d->block_content() #8 /tmp/skosmos-template-cache/f0/f006702710a64d478dd1b403f9804fd2.php(821): Twig\Template->displayBlock() #9 /var/www/html/vendor/twig/twig/src/Template.php(182): __TwigTemplate_035719bed7cb624643629b6867a7e29b->block_error() #10 /tmp/skosmos-template-cache/f0/f006702710a64d478dd1b403f9804fd2.php(190): Twig\Template->displayBlock() #11 /var/www/html/vendor/twig/twig/src/Template.php(405): __TwigTemplate_035719bed7cb624643629b6867a7e29b->doDisplay() #12 /var/www/html/vendor/twig/twig/src/Template.php(378): Twig\Template->displayWithErrorHandling() #13 /tmp/skosmos-template-cache/33/335961aeb615ac90d2d5e04aef7b22fb.php(54): Twig\Template->display() #14 /var/www/html/vendor/twig/twig/src/Template.php(405): __TwigTemplate_72da8b1f626220da62757349c4313b3d->doDisplay() #15 /var/www/html/vendor/twig/twig/src/Template.php(378): Twig\Template->displayWithErrorHandling() #16 /var/www/html/vendor/twig/twig/src/Template.php(390): Twig\Template->display() #17 /var/www/html/controller/WebController.php(187): Twig\Template->render() #18 /var/www/html/index.php(87): WebController->invokeVocabularyConcept() #19 {main} thrown in /var/www/html/model/Concept.php on line 663