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/post-template.php(256): apply_filters() #4 /var/www/vhosts/web7.host.knuba.de/html/stefan-brunner.com/wp-content/themes/sydney/content-page.php(23): the_content() #5 /var/www/vhosts/web7.host.knuba.de/html/stefan-brunner.com/wp-includes/template.php(812): require('...') #6 /var/www/vhosts/web7.host.knuba.de/html/stefan-brunner.com/wp-includes/template.php(745): load_template() #7 /var/www/vhosts/web7.host.knuba.de/html/stefan-brunner.com/wp-includes/general-template.php(206): locate_template() #8 /var/www/vhosts/web7.host.knuba.de/html/stefan-brunner.com/wp-content/themes/sydney/inc/extras.php(962): get_template_part() #9 /var/www/vhosts/web7.host.knuba.de/html/stefan-brunner.com/wp-includes/class-wp-hook.php(324): sydney_single_page_template() #10 /var/www/vhosts/web7.host.knuba.de/html/stefan-brunner.com/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters() #11 /var/www/vhosts/web7.host.knuba.de/html/stefan-brunner.com/wp-includes/plugin.php(517): WP_Hook->do_action() #12 /var/www/vhosts/web7.host.knuba.de/html/stefan-brunner.com/wp-content/themes/sydney/page.php(17): do_action() #13 /var/www/vhosts/web7.host.knuba.de/html/stefan-brunner.com/wp-includes/template-loader.php(106): include('...') #14 /var/www/vhosts/web7.host.knuba.de/html/stefan-brunner.com/wp-blog-header.php(19): require_once('...') #15 /var/www/vhosts/web7.host.knuba.de/html/stefan-brunner.com/index.php(17): require('...') #16 {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