Typecho\Widget::alloc(): Return value must be of type Typecho\Widget, none returned

TypeError: Typecho\Widget::alloc(): Return value must be of type Typecho\Widget, none returned in /www/wwwroot/ezo.biz/var/Typecho/Widget.php:189 Stack trace: #0 /www/wwwroot/ezo.biz/index.php(22): Typecho\Widget::alloc() #1 {main}