LOG FILE showing the following:

PHP Warning: sizeof(): Parameter must be an array or an object that implements Countable in /home/MYDOMAIN/public_html/includes/modules/pages/product_info/jscript_structured_data_product.php on line 38.

PHP Code:
$reviewCount = sizeof($reviewArray);
if ($reviewCount != 0) {
  $ratingValue = array_sum($ratingSum) / $reviewCount;
} else {
  $ratingValue = 0;
} 
Is there a fix?