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https://issues.apache.org/jira/browse/PDFBOX-4034?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16292720#comment-16292720
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Tilman Hausherr commented on PDFBOX-4034:
-----------------------------------------
As usual, it would be nice to have the documents.
> NPE thrown invoking PageIterator.enqueueKids
> --------------------------------------------
>
> Key: PDFBOX-4034
> URL: https://issues.apache.org/jira/browse/PDFBOX-4034
> Project: PDFBox
> Issue Type: Bug
> Components: PDModel
> Affects Versions: 2.0.8
> Reporter: Jorge Spinsanti
>
> A NPE is thrown inside java.util.ArrayDeque class invoking from
> PageIterator.enqueueKids when merging documents:
> {code}
> java.lang.NullPointerException
> at java.util.ArrayDeque.addLast(ArrayDeque.java:242)
> at java.util.ArrayDeque.add(ArrayDeque.java:408)
> at
> org.apache.pdfbox.pdmodel.PDPageTree$PageIterator.enqueueKids(PDPageTree.java:174)
> at
> org.apache.pdfbox.pdmodel.PDPageTree$PageIterator.enqueueKids(PDPageTree.java:169)
> at
> org.apache.pdfbox.pdmodel.PDPageTree$PageIterator.<init>(PDPageTree.java:159)
> at
> org.apache.pdfbox.pdmodel.PDPageTree$PageIterator.<init>(PDPageTree.java:153)
> at org.apache.pdfbox.pdmodel.PDPageTree.iterator(PDPageTree.java:123)
> at
> org.apache.pdfbox.multipdf.PDFMergerUtility.appendDocument(PDFMergerUtility.java:585)
> at
> org.apache.pdfbox.multipdf.PDFMergerUtility.mergeDocuments(PDFMergerUtility.java:266)
> ...
> {code}
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