Customizer not working / blank screen

Hello.

I’m using the CoziPress theme. My customizer suddenly went blank. I’ve tried disabling all the plugins, clearing cache, and switching themes but the problem persists. The widgets section produces the error below. Can anyone help me out?

Warning: array_search() expects parameter 2 to be array, bool given in /home/savetime/www/www/wp-includes/widgets.php on line 1458

Warning: array_search() expects parameter 2 to be array, bool given in /home/savetime/www/www/wp-includes/widgets.php on line 1458

Warning: array_search() expects parameter 2 to be array, bool given in /home/savetime/www/www/wp-includes/widgets.php on line 1458

Warning: array_merge(): Expected parameter 5 to be an array, bool given in /home/savetime/www/www/wp-includes/widgets.php on line 1291

Warning: array_diff(): Expected parameter 2 to be an array, null given in /home/savetime/www/www/wp-includes/widgets.php on line 1292

Warning: Invalid argument supplied for foreach() in /home/savetime/www/www/wp-includes/widgets.php on line 1294

Warning: array_merge(): Expected parameter 1 to be an array, null given in /home/savetime/www/www/wp-includes/widgets.php on line 1302

Warning: Cannot modify header information - headers already sent by (output started at /home/savetime/www/www/wp-includes/widgets.php:1458) in /home/savetime/www/www/wp-admin/admin-header.php on line 9