Fatal error: Uncaught Error: Call to a member function enqueue_frontend_resources() on null in /mnt/web612/b0/98/52166098/htdocs/Content/cms/wp-content/plugins/nextgen-gallery/src/Display/DisplayManager.php:150 Stack trace: #0 /mnt/web612/b0/98/52166098/htdocs/Content/cms/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 /mnt/web612/b0/98/52166098/htdocs/Content/cms/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 /mnt/web612/b0/98/52166098/htdocs/Content/cms/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)) #3 /mnt/web612/b0/98/52166098/htdocs/Content/cms/wp-content/plugins/nextgen-gallery/src/Display/DisplayManager.php(53): Imagely\NGG\Display\DisplayManager::enqueue_frontend_resources_for_content('Bereits zum zwe...') #4 /mnt/web612/b0/98/52166098/htdocs/Content/cms/wp-includes/class-wp-hook.php(324): Imagely\NGG\Display\DisplayManager->enqueue_frontend_resources('') #5 /mnt/web612/b0/98/52166098/htdocs/Content/cms/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(NULL, Array) #6 /mnt/web612/b0/98/52166098/htdocs/Content/cms/wp-includes/plugin.php(517): WP_Hook->do_action(Array) #7 /mnt/web612/b0/98/52166098/htdocs/Content/cms/wp-includes/script-loader.php(2263): do_action('wp_enqueue_scri...') #8 /mnt/web612/b0/98/52166098/htdocs/Content/cms/wp-includes/class-wp-hook.php(324): wp_enqueue_scripts('') #9 /mnt/web612/b0/98/52166098/htdocs/Content/cms/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(NULL, Array) #10 /mnt/web612/b0/98/52166098/htdocs/Content/cms/wp-includes/plugin.php(517): WP_Hook->do_action(Array) #11 /mnt/web612/b0/98/52166098/htdocs/Content/cms/wp-includes/general-template.php(3065): do_action('wp_head') #12 /mnt/web612/b0/98/52166098/htdocs/Content/cms/wp-content/themes/fw/header.php(8): wp_head() #13 /mnt/web612/b0/98/52166098/htdocs/Content/cms/wp-includes/template.php(810): require_once('/mnt/web612/b0/...') #14 /mnt/web612/b0/98/52166098/htdocs/Content/cms/wp-includes/template.php(745): load_template('/mnt/web612/b0/...', true, Array) #15 /mnt/web612/b0/98/52166098/htdocs/Content/cms/wp-includes/general-template.php(48): locate_template(Array, true, true, Array) #16 /mnt/web612/b0/98/52166098/htdocs/Content/cms/wp-content/themes/fw/single.php(1): get_header() #17 /mnt/web612/b0/98/52166098/htdocs/Content/cms/wp-includes/template-loader.php(106): include('/mnt/web612/b0/...') #18 /mnt/web612/b0/98/52166098/htdocs/Content/cms/wp-blog-header.php(19): require_once('/mnt/web612/b0/...') #19 /mnt/web612/b0/98/52166098/htdocs/Content/cms/index.php(17): require('/mnt/web612/b0/...') #20 {main} thrown in /mnt/web612/b0/98/52166098/htdocs/Content/cms/wp-content/plugins/nextgen-gallery/src/Display/DisplayManager.php on line 150