Apache goes down when I'm trying to add keywords to a AdGroup

[Minor]

Hi.

I've tried to google anything about that but didn't find anything.
I've created a script that successfully gets and creates a campaign/
adgroup.
But when I'm trying to add one or more keywords to adgroup, windows
says that appache would be closed due to error.

I'm using Win7+Apache/2.2.4 (Win32) + PHP/5.3.1
And I'm using API 201008
Here's a chunk of code that causes an error.

================================
foreach ($keywords as $index => $keyword)
        {
            // Create keyword.
            $keyword = new Keyword();
            $keyword->text = $keyword;
            $keyword->matchType = 'BROAD';

            // Create biddable ad group criterion.
            $keywordAdGroupCriterion[$index] = new
BiddableAdGroupCriterion();
            $keywordAdGroupCriterion[$index]->adGroupId = $adGroupId;
            $keywordAdGroupCriterion[$index]->criterion = $keyword;

            // Create operations.
            $keywordAdGroupCriterionOperation[$index] = new
AdGroupCriterionOperation();
            $keywordAdGroupCriterionOperation[$index]->operand =
$keywordAdGroupCriterion[$index];
            $keywordAdGroupCriterionOperation[$index]->operator =
'ADD';

            $operations[$index] =
$keywordAdGroupCriterionOperation[$index];
        }

        // Add ad group criteria.
        if(!empty($operations))
            $result = $adGroupCriterionService-
>mutate($operations); // <-- this line causes an error
================================

I'll try to find out where's the problem in the mutate function. And
I'll be very thankful if you'll help me with this.
Please ask if you need some additional info.

Thanks,
Alex

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