[ 
https://issues.apache.org/jira/browse/PDFBOX-4063?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Jorge Spinsanti updated PDFBOX-4063:
------------------------------------
    Description: 
I got NullPointerException to merge PDF files (can not be attached because they 
are sensible information):
{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}

  was:
I got NullPointerException to merge PDF files (can not be attached because they 
are sensible information):
{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]


> NPE at PageIterator.enqueueKids
> -------------------------------
>
>                 Key: PDFBOX-4063
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-4063
>             Project: PDFBox
>          Issue Type: Bug
>          Components: PDModel
>    Affects Versions: 2.0.8
>            Reporter: Jorge Spinsanti
>
> I got NullPointerException to merge PDF files (can not be attached because 
> they are sensible information):
> {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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