[IP.Board 3.1.3 / PHP 7.2] «count(): Parameter must be an array or an object that implements Countable in admin/sources/classes/search/controller.php on line 558»

IP.Board
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PHP Warning: count(): Parameter must be an array or an object that implements Countable inadmin/sources/classes/search/controller.php on line 558

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How to fix

Locate the line in the admin/sources/classes/search/controller.php file:

if ( count( $this->_results ) )

Replace it with:

if ($this->_results && count($this->_results))