Fatal error: Uncaught TypeError: usort(): Argument #1 ($array) must be of type array, null given in /var/www/islab.di.uniba.it/wp-content/plugins/insert-php-code-snippet/shortcode-handler.php(100) : eval()'d code:131 Stack trace: #0 /var/www/islab.di.uniba.it/wp-content/plugins/insert-php-code-snippet/shortcode-handler.php(100) : eval()'d code(131): usort(NULL, 'majority') #1 /var/www/islab.di.uniba.it/wp-content/plugins/insert-php-code-snippet/shortcode-handler.php(100) : eval()'d code(162): getpubdata(NULL) #2 /var/www/islab.di.uniba.it/wp-content/plugins/insert-php-code-snippet/shortcode-handler.php(100) : eval()'d code(3): publist() #3 /var/www/islab.di.uniba.it/wp-content/plugins/insert-php-code-snippet/shortcode-handler.php(100): eval() #4 /var/www/islab.di.uniba.it/wp-includes/shortcodes.php(434): xyz_ips_display_content(Array, '', 'xyz-ips') #5 [internal function]: do_shortcode_tag(Array) #6 /var/www/islab.di.uniba.it/wp-includes/shortcodes.php(273): preg_replace_callback('/\\[(\\[?)(xyz\\-i...', 'do_shortcode_ta...', '<p>[xyz-ips sni...') #7 /var/www/islab.di.uniba.it/wp-content/themes/Impreza/framework/shortcodes/vc_column_text.php(36): do_shortcode('<p>[xyz-ips sni...') #8 /var/www/islab.di.uniba.it/wp-content/themes/Impreza/framework/functions/shortcodes.php(137): require('/var/www/islab....') #9 /var/www/islab.di.uniba.it/wp-includes/shortcodes.php(434): US_Shortcodes->__call('vc_column_text', Array) #10 [internal function]: do_shortcode_tag(Array) #11 /var/www/islab.di.uniba.it/wp-includes/shortcodes.php(273): preg_replace_callback('/\\[(\\[?)(xyz\\-i...', 'do_shortcode_ta...', '[vc_column_text...') #12 /var/www/islab.di.uniba.it/wp-content/themes/Impreza/framework/shortcodes/vc_column.php(89): do_shortcode('[vc_column_text...') #13 /var/www/islab.di.uniba.it/wp-content/themes/Impreza/framework/functions/shortcodes.php(137): require('/var/www/islab....') #14 /var/www/islab.di.uniba.it/wp-includes/shortcodes.php(434): US_Shortcodes->__call('vc_column', Array) #15 [internal function]: do_shortcode_tag(Array) #16 /var/www/islab.di.uniba.it/wp-includes/shortcodes.php(273): preg_replace_callback('/\\[(\\[?)(xyz\\-i...', 'do_shortcode_ta...', '[vc_column][vc_...') #17 /var/www/islab.di.uniba.it/wp-content/themes/Impreza/framework/shortcodes/vc_row.php(175): do_shortcode('[vc_column][vc_...') #18 /var/www/islab.di.uniba.it/wp-content/themes/Impreza/framework/functions/shortcodes.php(137): require('/var/www/islab....') #19 /var/www/islab.di.uniba.it/wp-includes/shortcodes.php(434): US_Shortcodes->__call('vc_row', Array) #20 [internal function]: do_shortcode_tag(Array) #21 /var/www/islab.di.uniba.it/wp-includes/shortcodes.php(273): preg_replace_callback('/\\[(\\[?)(xyz\\-i...', 'do_shortcode_ta...', '[vc_row][vc_col...') #22 /var/www/islab.di.uniba.it/wp-includes/class-wp-hook.php(324): do_shortcode('[vc_row][vc_col...') #23 /var/www/islab.di.uniba.it/wp-includes/plugin.php(205): WP_Hook->apply_filters('[vc_row][vc_col...', Array) #24 /var/www/islab.di.uniba.it/wp-content/themes/Impreza/framework/templates/page.php(20): apply_filters('the_content', '[vc_row][vc_col...') #25 /var/www/islab.di.uniba.it/wp-content/themes/Impreza/framework/functions/helpers.php(130): include('/var/www/islab....') #26 /var/www/islab.di.uniba.it/wp-content/themes/Impreza/page.php(10): us_load_template('templates/page') #27 /var/www/islab.di.uniba.it/wp-includes/template-loader.php(106): include('/var/www/islab....') #28 /var/www/islab.di.uniba.it/wp-blog-header.php(19): require_once('/var/www/islab....') #29 /var/www/islab.di.uniba.it/index.php(17): require('/var/www/islab....') #30 {main} thrown in /var/www/islab.di.uniba.it/wp-content/plugins/insert-php-code-snippet/shortcode-handler.php(100) : eval()'d code on line 131