Fatal error: Uncaught ArgumentCountError: array_merge() does not accept unknown named parameters in /usr/www/users/plustmefgr/wp-includes/widgets.php:1261
Stack trace:
#0 /usr/www/users/plustmefgr/wp-includes/widgets.php(1261): array_merge(wp_inactive_widgets: Array, sidebar-1: Array, sidebar-2: Array)
#1 /usr/www/users/plustmefgr/wp-includes/widgets.php(1216): retrieve_widgets(true)
#2 /usr/www/users/plustmefgr/wp-includes/class-wp-hook.php(289): _wp_sidebars_changed('monstroid2')
#3 /usr/www/users/plustmefgr/wp-includes/class-wp-hook.php(311): WP_Hook->apply_filters(NULL, Array)
#4 /usr/www/users/plustmefgr/wp-includes/plugin.php(478): WP_Hook->do_action(Array)
#5 /usr/www/users/plustmefgr/wp-includes/theme.php(2977): do_action('after_switch_th...', 'monstroid2', Object(WP_Theme))
#6 /usr/www/users/plustmefgr/wp-includes/class-wp-hook.php(287): check_theme_switched('')
#7 /usr/www/users/plustmefgr/wp-includes/class-wp-hook.php(311): WP_Hook->apply_filters(NULL, Array)
#8 /usr/www/users/plustmefgr/wp-includes/plugin.php(478): WP_Hook->do_action(Array)
#9 /usr/www/users/plustmefgr/wp-settings.php(540): do_action('init')
#10 /usr/www/users/plustmefgr/wp-config.php(46): require_once('/usr/www/users/...')
#11 /usr/www/users/plustmefgr/wp-load.php(37): require_once('/usr/www/users/...')
#12 /usr/www/users/plustmefgr/wp-blog-header.php(13): require_once('/usr/www/users/...')
#13 /usr/www/users/plustmefgr/index.php(17): require('/usr/www/users/...')
#14 {main}
  thrown in /usr/www/users/plustmefgr/wp-includes/widgets.php on line 1261