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