Fatal error: Uncaught TypeError: array_merge(): Argument #8 must be of type array, null given in /home/virt1050/domains/zpobebelno.edu.pl/public_html/wp-includes/widgets.php:1346 Stack trace: #0 /home/virt1050/domains/zpobebelno.edu.pl/public_html/wp-includes/widgets.php(1346): array_merge(Array, Array, Array, Array, Array, Array, Array, NULL, NULL, NULL, NULL) #1 /home/virt1050/domains/zpobebelno.edu.pl/public_html/wp-includes/widgets.php(1291): retrieve_widgets(true) #2 /home/virt1050/domains/zpobebelno.edu.pl/public_html/wp-includes/class-wp-hook.php(326): _wp_sidebars_changed('GeneratePress') #3 /home/virt1050/domains/zpobebelno.edu.pl/public_html/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(NULL, Array) #4 /home/virt1050/domains/zpobebelno.edu.pl/public_html/wp-includes/plugin.php(517): WP_Hook->do_action(Array) #5 /home/virt1050/domains/zpobebelno.edu.pl/public_html/wp-includes/theme.php(3496): do_action('after_switch_th...', 'GeneratePress', Object(WP_Theme)) #6 /home/virt1050/domains/zpobebelno.edu.pl/public_html/wp-includes/class-wp-hook.php(324): check_theme_switched('') #7 /home/virt1050/domains/zpobebelno.edu.pl/public_html/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(false, Array) #8 /home/virt1050/domains/zpobebelno.edu.pl/public_html/wp-includes/plugin.php(517): WP_Hook->do_action(Array) #9 /home/virt1050/domains/zpobebelno.edu.pl/public_html/wp-settings.php(695): do_action('init') #10 /home/virt1050/domains/zpobebelno.edu.pl/public_html/wp-config.php(114): require_once('/home/virt1050/...') #11 /home/virt1050/domains/zpobebelno.edu.pl/public_html/wp-load.php(50): require_once('/home/virt1050/...') #12 /home/virt1050/domains/zpobebelno.edu.pl/public_html/wp-blog-header.php(13): require_once('/home/virt1050/...') #13 /home/virt1050/domains/zpobebelno.edu.pl/public_html/index.php(17): require('/home/virt1050/...') #14 {main} thrown in /home/virt1050/domains/zpobebelno.edu.pl/public_html/wp-includes/widgets.php on line 1346