Missing $print variable

Hi

I am debugging why pdf-printing is not working in my productionserver (but works in my development). But then I found some bug in the code.
In: print/print_pdf/print_pdf.pages.inc on row: 57->

$pdf = print_pdf_generate_path($path, $cid, $pdf_filename);
if ($pdf == NULL) {
  drupal_goto($print['url']);
  exit;
}

Here if the pdf generation fails with should goto som other url. But the $print variable is not defined in function print_pdf_controller()