Fatal error when I open export setting

Good afternoon,

I want open export settings of two of my exports, and it give an error:

PHP Fatal error: Uncaught Error: Unsupported operand types in /var/www/vhosts/newsiciliacasa.it/httpdocs/wp-content/plugins/wp-all-exporto-pro/controllers/admin/export.php:398
Stack trace:
#0 /var/www/vhosts/newsiciliacasa.it/httpdocs/wp-content/plugins/wp-all-exporto-pro/controllers/admin/manage.php(75): PMXE_Admin_Export->options()
#1 /var/www/vhosts/newsiciliacasa.it/httpdocs/wp-content/plugins/wp-all-exporto-pro/wp-all-export-pro.php(411): PMXE_Admin_Manage->options()
#2 /var/www/vhosts/newsiciliacasa.it/httpdocs/wp-includes/class-wp-hook.php(288): PMXE_Plugin->adminInit()
#3 /var/www/vhosts/newsiciliacasa.it/httpdocs/wp-includes/class-wp-hook.php(312): WP_Hook->apply_filters()
#4 /var/www/vhosts/newsiciliacasa.it/httpdocs/wp-includes/plugin.php(478): WP_Hook->do_action()
#5 /var/www/vhosts/newsiciliacasa.it/httpdocs/wp-admin/admin.php(170): do_action()
#6 {main}
thrown in /var/www/vhosts/newsiciliacasa.it/httpdocs/wp-content/plugins/wp-all-exporto-pro/controllers/admin/export.php on line 398

PHP version: 7.4.3
Wordpress version: 5.3.2
WP All Export Pro: 1.5.1 (I can’t update it because it ask me the license, but it is in another PC and I can’t get it for a little of time, but before the plugin never gave this error)

Only one export go correctly: I can run it, can open the import settings etc etc…

Can you help me please?

Best regards