phpMyFAQ

$result is a mysqli_result object, I patch the code doing this:

if($result !== false)
$num_rows = mysqli_num_rows($result);
else
$num_rows = 0;

This is on /inc/PMF_DB/Mysqli.php line 176. So

public function num_rows($result)
{
if($result !== false)
$num_rows = mysqli_num_rows ($result ...