After upgrading or downgrading version, the previous string not working

Hello Plugin Author, please refer to this thread

I realize different version of BM may not work as usual.

global $wpdb;

$user_id = 1;
$conversations_number = (int) $wpdb->get_var( $wpdb->prepare("SELECT COUNT(*) FROM 
" . bm_get_table('recipients') . "
 WHERE 
user_id
 = %d", $user_id) );

is this $conversations_number working for all versions of BM? Thank you!