Problem in Metadata tab and Duplicated Post Meta function

I just wanted to delete some old and unnecessary user metas in the Metadata tab, when I encountered the following message in my browser:

Server error. Please check your PHP Error Logs.

Invalid attempt to spread non-iterable instance.
In order to be iterable, nan-array objects must have a [Symbol.iterator] () method.

Here are the errors recorded in the error log:

PHP Fatal error:  Uncaught Error: Invalid table specified in /home/public_html/wp-content/plugins/database-cleaner/classes/admin.php:344
Stack trace:
#0 /home/public_html/wp-content/plugins/database-cleaner/classes/rest.php(556): Meow_DBCLNR_Admin->delete_metadata('9LhMIcj_usermet...', Array)
#1 /home/public_html/wp-includes/rest-api/class-wp-rest-server.php(1181): Meow_DBCLNR_Rest->rest_delete_metadata(Object(WP_REST_Request))
#2 /home/public_html/wp-includes/rest-api/class-wp-rest-server.php(1028): WP_REST_Server->respond_to_request(Object(WP_REST_Request), '/database-clean...', Array, NULL)
#3 /home/public_html/wp-includes/rest-api/class-wp-rest-server.php(442): WP_REST_Server->dispatch(Object(WP_REST_Request))
#4 /home/public_html/wp-includes/rest-api.php(410): WP_REST_Server->serve_request('/database-clean...')
#5 /home/public_html/wp-includes/class-wp-hook.php(308): rest_api_loaded(Object(WP))
#6 /home/public_html/wp-includes/class-wp-hook.ph in /home/public_html/wp-content/plugins/database-cleaner/classes/admin.php on line 344

Also, the number of Duplicated Post Metas on my site in the Posts Metadata section of the WordPress core plugin is 428, but when I hit the clean button to delete them, after a long period of time and consecutive percentages of 20% to 80% and Its completion, but it still shows the same 428 and none has been deleted.