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Fatal error: Uncaught TypeError: array_map(): Argument #2 ($array) must be of type array, null given in /var/www/vhosts/kooperationssysteme.de/httpdocs/wp-content/plugins/mendeleyplugin/wp-mendeley.php:277 Stack trace: #0 /var/www/vhosts/kooperationssysteme.de/httpdocs/wp-content/plugins/mendeleyplugin/wp-mendeley.php(277): array_map() #1 /var/www/vhosts/kooperationssysteme.de/httpdocs/wp-content/plugins/mendeleyplugin/wp-mendeley.php(240): MendeleyPlugin->detailsFormat() #2 /var/www/vhosts/kooperationssysteme.de/httpdocs/wp-includes/shortcodes.php(433): MendeleyPlugin->processShortcodeDetails() #3 [internal function]: do_shortcode_tag() #4 /var/www/vhosts/kooperationssysteme.de/httpdocs/wp-includes/shortcodes.php(273): preg_replace_callback() #5 /var/www/vhosts/kooperationssysteme.de/httpdocs/wp-includes/class-wp-hook.php(324): do_shortcode() #6 /var/www/vhosts/kooperationssysteme.de/httpdocs/wp-includes/plugin.php(205): WP_Hook->apply_filters() #7 /var/www/vhosts/kooperationssysteme.de/httpdocs/wp-includes/post-template.php(256): apply_filters() #8 /var/www/vhosts/kooperationssysteme.de/httpdocs/wp-content/themes/spacious/content-page.php(26): the_content() #9 /var/www/vhosts/kooperationssysteme.de/httpdocs/wp-includes/template.php(792): require('...') #10 /var/www/vhosts/kooperationssysteme.de/httpdocs/wp-includes/template.php(725): load_template() #11 /var/www/vhosts/kooperationssysteme.de/httpdocs/wp-includes/general-template.php(206): locate_template() #12 /var/www/vhosts/kooperationssysteme.de/httpdocs/wp-content/themes/spacious/page.php(17): get_template_part() #13 /var/www/vhosts/kooperationssysteme.de/httpdocs/wp-includes/template-loader.php(106): include('...') #14 /var/www/vhosts/kooperationssysteme.de/httpdocs/wp-blog-header.php(19): require_once('...') #15 /var/www/vhosts/kooperationssysteme.de/httpdocs/index.php(17): require('...') #16 {main} thrown in /var/www/vhosts/kooperationssysteme.de/httpdocs/wp-content/plugins/mendeleyplugin/wp-mendeley.php on line 277