Fatal error: Uncaught TypeError: in_array(): Argument #2 ($haystack) must be of type array, string given in /var/www/vhosts/web7.host.knuba.de/html/stefan-brunner.com/wp-content/plugins/facebook-button-plugin/facebook-button-plugin.php:813
Stack trace:
#0 /var/www/vhosts/web7.host.knuba.de/html/stefan-brunner.com/wp-content/plugins/facebook-button-plugin/facebook-button-plugin.php(813): in_array()
#1 /var/www/vhosts/web7.host.knuba.de/html/stefan-brunner.com/wp-includes/class-wp-hook.php(324): fcbkbttn_display_button()
#2 /var/www/vhosts/web7.host.knuba.de/html/stefan-brunner.com/wp-includes/plugin.php(205): WP_Hook->apply_filters()
#3 /var/www/vhosts/web7.host.knuba.de/html/stefan-brunner.com/wp-includes/formatting.php(3980): apply_filters()
#4 /var/www/vhosts/web7.host.knuba.de/html/stefan-brunner.com/wp-includes/class-wp-hook.php(324): wp_trim_excerpt()
#5 /var/www/vhosts/web7.host.knuba.de/html/stefan-brunner.com/wp-includes/plugin.php(205): WP_Hook->apply_filters()
#6 /var/www/vhosts/web7.host.knuba.de/html/stefan-brunner.com/wp-includes/post-template.php(436): apply_filters()
#7 /var/www/vhosts/web7.host.knuba.de/html/stefan-brunner.com/wp-content/plugins/wordpress-seo/src/helpers/post-helper.php(86): get_the_excerpt()
#8 /var/www/vhosts/web7.host.knuba.de/html/stefan-brunner.com/wp-content/plugins/wordpress-seo/src/presentations/indexable-post-type-presentation.php(196): Yoast\WP\SEO\Helpers\Post_Helper->get_the_excerpt()
#9 /var/www/vhosts/web7.host.knuba.de/html/stefan-brunner.com/wp-content/plugins/wordpress-seo/src/presentations/abstract-presentation.php(66): Yoast\WP\SEO\Presentations\Indexable_Post_Type_Presentation->generate_open_graph_description()
#10 /var/www/vhosts/web7.host.knuba.de/html/stefan-brunner.com/wp-content/plugins/wordpress-seo/src/presenters/open-graph/description-presenter.php(33): Yoast\WP\SEO\Presentations\Abstract_Presentation->__get()
#11 /var/www/vhosts/web7.host.knuba.de/html/stefan-brunner.com/wp-content/plugins/wordpress-seo/src/presenters/abstract-indexable-tag-presenter.php(37): Yoast\WP\SEO\Presenters\Open_Graph\Description_Presenter->get()
#12 /var/www/vhosts/web7.host.knuba.de/html/stefan-brunner.com/wp-content/plugins/wordpress-seo/src/integrations/front-end-integration.php(406): Yoast\WP\SEO\Presenters\Abstract_Indexable_Tag_Presenter->present()
#13 /var/www/vhosts/web7.host.knuba.de/html/stefan-brunner.com/wp-includes/class-wp-hook.php(324): Yoast\WP\SEO\Integrations\Front_End_Integration->present_head()
#14 /var/www/vhosts/web7.host.knuba.de/html/stefan-brunner.com/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters()
#15 /var/www/vhosts/web7.host.knuba.de/html/stefan-brunner.com/wp-includes/plugin.php(517): WP_Hook->do_action()
#16 /var/www/vhosts/web7.host.knuba.de/html/stefan-brunner.com/wp-content/plugins/wordpress-seo/src/integrations/front-end-integration.php(377): do_action()
#17 /var/www/vhosts/web7.host.knuba.de/html/stefan-brunner.com/wp-includes/class-wp-hook.php(324): Yoast\WP\SEO\Integrations\Front_End_Integration->call_wpseo_head()
#18 /var/www/vhosts/web7.host.knuba.de/html/stefan-brunner.com/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters()
#19 /var/www/vhosts/web7.host.knuba.de/html/stefan-brunner.com/wp-includes/plugin.php(517): WP_Hook->do_action()
#20 /var/www/vhosts/web7.host.knuba.de/html/stefan-brunner.com/wp-includes/general-template.php(3065): do_action()
#21 /var/www/vhosts/web7.host.knuba.de/html/stefan-brunner.com/wp-content/themes/sydney/header.php(17): wp_head()
#22 /var/www/vhosts/web7.host.knuba.de/html/stefan-brunner.com/wp-includes/template.php(810): require_once('...')
#23 /var/www/vhosts/web7.host.knuba.de/html/stefan-brunner.com/wp-includes/template.php(745): load_template()
#24 /var/www/vhosts/web7.host.knuba.de/html/stefan-brunner.com/wp-includes/general-template.php(48): locate_template()
#25 /var/www/vhosts/web7.host.knuba.de/html/stefan-brunner.com/wp-content/themes/sydney/single.php(8): get_header()
#26 /var/www/vhosts/web7.host.knuba.de/html/stefan-brunner.com/wp-includes/template-loader.php(106): include('...')
#27 /var/www/vhosts/web7.host.knuba.de/html/stefan-brunner.com/wp-blog-header.php(19): require_once('...')
#28 /var/www/vhosts/web7.host.knuba.de/html/stefan-brunner.com/index.php(17): require('...')
#29 {main}
thrown in /var/www/vhosts/web7.host.knuba.de/html/stefan-brunner.com/wp-content/plugins/facebook-button-plugin/facebook-button-plugin.php on line 813