Warning: Attempt to read property "title" on array in /var/www/html/blog/single.php on line 13

Fatal error: Uncaught TypeError: Page::set_title(): Argument #1 ($title) must be of type string, null given, called in /var/www/html/blog/single.php on line 13 and defined in /var/www/html/classes/Page.php:36 Stack trace: #0 /var/www/html/blog/single.php(13): Page->set_title(NULL) #1 {main} thrown in /var/www/html/classes/Page.php on line 36