Fatal error: Uncaught Error: Call to a member function enqueue_frontend_resources() on null in /www/doc/www.didaktik-jc.cz/www/wp-content/plugins/nextgen-gallery/src/Display/DisplayManager.php:150
Stack trace:
#0 /www/doc/www.didaktik-jc.cz/www/wp-content/plugins/nextgen-gallery/src/Display/DisplayManager.php(136): Imagely\NGG\Display\DisplayManager::enqueue_frontend_resources_for_displayed_gallery(Object(Imagely\NGG\DataTypes\DisplayedGallery), NULL)
#1 /www/doc/www.didaktik-jc.cz/www/wp-content/plugins/nextgen-gallery/src/Display/DisplayManager.php(153): Imagely\NGG\Display\DisplayManager::enqueue_frontend_resources_for_alternate_displayed_gallery(Object(Imagely\NGG\DataTypes\DisplayedGallery), Object(Imagely\NGG\DisplayTypes\Thumbnails))
#2 /www/doc/www.didaktik-jc.cz/www/wp-content/plugins/nextgen-gallery/src/Display/DisplayManager.php(112): Imagely\NGG\Display\DisplayManager::enqueue_frontend_resources_for_displayed_gallery(Object(Imagely\NGG\DataTypes\DisplayedGallery), Object(Imagely\NGG\DisplayTypes\Thumbnails))
# in /www/doc/www.didaktik-jc.cz/www/wp-content/plugins/nextgen-gallery/src/Display/DisplayManager.php on line 150