How can I safely check is node empty or not? (Symfony 2 Crawler)

Question

When I try to take some nonexistent content from page I catch this error:

The current node list is empty.
500 Internal Server Error - InvalidArgumentException 
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Answer 1

$marks = $crawler->filter('.PropertyBody')->count()
    ? $crawler->filter('.PropertyBody')->eq(2)->text() 
    : '';