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I use the following code to create a PdfReader instance:

FileInputStream pdfIn = new FileInputStream("c:/temp/20501217.pdf");
ByteArrayOutputStream stampedPdfBAOS = new ByteArrayOutputStream();
try {
PdfReader reader = new PdfReader(pdfIn);

This throws an exception producing the following stack trace:

java.lang.ArrayIndexOutOfBoundsException: -1
    at java.util.ArrayList.get(ArrayList.java:323)
    at com.itextpdf.text.pdf.PdfReader.removeUnusedNode(PdfReader.java:3042)
    at com.itextpdf.text.pdf.PdfReader.removeUnusedObjects(PdfReader.java:3086)
    at com.itextpdf.text.pdf.PdfReader.readPdf(PdfReader.java:528)
    at com.itextpdf.text.pdf.PdfReader.<init>(PdfReader.java:237)
    at com.itextpdf.text.pdf.PdfReader.<init>(PdfReader.java:247)

I'm using iText version 5.0.4, and the PDF is valid.

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