eZ\Publish\Core\Repository\SearchService::validateContentCriteria PHP Method

    protected function validateContentCriteria(array $criteria, $argumentName)
    {
        foreach ($criteria as $criterion) {
            if ($criterion instanceof LocationCriterion) {
                throw new InvalidArgumentException($argumentName, 'Location criterions cannot be used in Content search');
            }
            if ($criterion instanceof LogicalOperator) {
                $this->validateContentCriteria($criterion->criteria, $argumentName);
            }
        }
    }