NPE in PDPageNode

i get a nullpointer exception when parsing a pdf with tika.

http://www.awsg.at/portal/media/4218.pdf

java.lang.NullPointerException
at org.apache.pdfbox.pdmodel.PDPageNode.getCount(PDPageNode.java:109)
at
org.apache.pdfbox.pdmodel.PDDocument.getNumberOfPages(PDDocument.java:943)
at
org.apache.tika.parser.pdf.PDFParser.extractMetadata(PDFParser.java:105)
at org.apache.tika.parser.pdf.PDFParser.parse(PDFParser.java:86)