Fatal error: Uncaught TypeError: method_exists(): Argument #1 ($object_or_class) must be of type object|string, bool 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/d6/d6ef8bf069a9bf8620e3fc8b11b6bee4.php(400): twig_get_attribute() #4 /var/www/html/vendor/twig/twig/src/Template.php(405): __TwigTemplate_4a133ec8170bb987cf81e047e03bcf0f->doDisplay() #5 /var/www/html/vendor/twig/twig/src/Template.php(378): Twig\Template->displayWithErrorHandling() #6 /tmp/skosmos-template-cache/86/8612c09fff2dd310f927229235d49bff.php(75): Twig\Template->display() #7 /var/www/html/vendor/twig/twig/src/Template.php(182): __TwigTemplate_323be7b059145f97e9c05e7e571201af->block_content() #8 /tmp/skosmos-template-cache/3f/3f36534ee31cad2accf81ffaced5b933.php(821): Twig\Template->displayBlock() #9 /var/www/html/vendor/twig/twig/src/Template.php(182): __TwigTemplate_e7920fbd86173539e3124b329713628a->block_error() #10 /tmp/skosmos-template-cache/3f/3f36534ee31cad2accf81ffaced5b933.php(190): Twig\Template->displayBlock() #11 /var/www/html/vendor/twig/twig/src/Template.php(405): __TwigTemplate_e7920fbd86173539e3124b329713628a->doDisplay() #12 /var/www/html/vendor/twig/twig/src/Template.php(378): Twig\Template->displayWithErrorHandling() #13 /tmp/skosmos-template-cache/86/8612c09fff2dd310f927229235d49bff.php(54): Twig\Template->display() #14 /var/www/html/vendor/twig/twig/src/Template.php(405): __TwigTemplate_323be7b059145f97e9c05e7e571201af->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(197): 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