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https://issues.apache.org/jira/browse/PDFBOX-3318?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15964563#comment-15964563
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Jay Askren commented on PDFBOX-3318:
------------------------------------

If you can come up with a solution, that would be awesome.  I have a lot more 
pdfs that result in the same error.  I could test the solution for you.  Until 
then, we can just remove the null byte and see if that fixes the problem on the 
other pdfs.

> IllegalArgumentException in PDPageTree constructor: root cannot be null
> -----------------------------------------------------------------------
>
>                 Key: PDFBOX-3318
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-3318
>             Project: PDFBox
>          Issue Type: Bug
>          Components: PDModel
>    Affects Versions: 2.0.0
>            Reporter: Arul Dhesiaseelan
>         Attachments: rootCannotBeNull.pdf
>
>
> When merging this pdf with another pdf, I get this exception. It looks 
> similar to PDFBOX-2615.
> {code}
> java.lang.IllegalArgumentException: root cannot be null
>       at org.apache.pdfbox.pdmodel.PDPageTree.<init>(PDPageTree.java:75)
>       at 
> org.apache.pdfbox.pdmodel.PDDocumentCatalog.getPages(PDDocumentCatalog.java:128)
>       at 
> org.apache.pdfbox.multipdf.PDFMergerUtility.appendDocument(PDFMergerUtility.java:484)
>       at 
> org.apache.pdfbox.multipdf.PDFMergerUtility.mergeDocuments(PDFMergerUtility.java:213)
> {code}



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