PHP Warning causing sql timeouts? - php

Question

I got a whole heap of (foreach()) warnings on my server log. Could they be causing sql timeout on my db via a sql connection leak?
I'm not entirely sure how to resolve the problem but i read that i need to add this bit of code:
if (is_array($values) || is_object($values))
{
foreach ($values as $value)
{
...
}
}
...into my .php but dont really know where to add it or why? sorry noob here again.
Here's my code section for: PHP Warning:
Invalid argument supplied for foreach() in
/hermes/bosnacweb03/bosnacweb03aa/b1245/ipg.tinsflowershop/panga/classes/ImageType.php
on line 148
(Line 148 starts - foreach ($results as $result) {)
/**
* Finds image type definition by name and type
* #param string $name
* #param string $type
*/
public static function getByNameNType($name, $type = null, $order = 0)
{
static $is_passed = false;
if (!isset(self::$images_types_name_cache[$name.'_'.$type.'_'.$order]) && !$is_passed) {
$results = Db::getInstance()->ExecuteS('SELECT * FROM `'._DB_PREFIX_.'image_type`');
$types = array('products', 'categories', 'manufacturers', 'suppliers', 'scenes', 'stores');
$total = count($types);
foreach ($results as $result) {
foreach ($result as $value) {
for ($i = 0; $i < $total; ++$i) {
self::$images_types_name_cache[$result['name'].'_'.$types[$i].'_'.$value] = $result;
}
}
}
$is_passed = true;
}
I assume that all the warnings on my log are the same issue? eg:
PHP Warning: Invalid argument supplied for foreach() in
/hermes/bosnacweb03/bosnacweb03aa/b1245/ipg.tinsflowershop/panga/classes/Category.php
on line 594