Trisia opened a new pull request, #177:
URL: https://github.com/apache/pdfbox/pull/177
example:
```
125 0 obj
<</Tabs/S/Group<</S/Transparency/Type/Group/CS/DeviceRGB>>/Contents[69 0 R
3646 0 R 70 0 R]/Type/Page/QITE_pageid<</UF 3619 0 R/P 5/D(AA\r)/F 3620 0 R/I
3621 0 R>>/Resources<</ExtGState<</Xi10 1 0 R/GS7 3640 0 R/GS8 3641 0
R>>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI]/Font<</F7 3633 0 R/F8 3624 0 R/F9
3642 0 R/F1 3627 0 R/F2 3628 0 R/F3 3629 0 R/Xi11 2 0 R>>>>/Parent 82 0
R/StructParents 5/MediaBox[0 0 595.2 841.92]>>
```
see
```
QITE_pageid<</UF 3619 0 R/P 5/D(AA\r)/F 3620 0 R/I 3621 0 R>>
```
object `3621 0 R` is not defined
When I use `PDDocument.saveIncremental` to save the document it causes the
following error:
```
java.lang.NullPointerException
at java.util.Hashtable.computeIfAbsent(Hashtable.java:1004)
at
org.apache.pdfbox.pdfwriter.COSWriter.getObjectKey(COSWriter.java:1089)
at
org.apache.pdfbox.pdfwriter.COSWriter.writeReference(COSWriter.java:1367)
at
org.apache.pdfbox.pdfwriter.COSWriter.visitFromDictionary(COSWriter.java:1207)
at
org.apache.pdfbox.pdfwriter.COSWriter.writeDictionary(COSWriter.java:1155)
at
org.apache.pdfbox.pdfwriter.COSWriter.visitFromDictionary(COSWriter.java:1202)
at org.apache.pdfbox.cos.COSDictionary.accept(COSDictionary.java:1265)
at
org.apache.pdfbox.pdfwriter.COSWriter.doWriteObject(COSWriter.java:610)
at
org.apache.pdfbox.pdfwriter.COSWriter.doWriteObject(COSWriter.java:643)
at
org.apache.pdfbox.pdfwriter.COSWriter.doWriteObjects(COSWriter.java:540)
at org.apache.pdfbox.pdfwriter.COSWriter.doWriteBody(COSWriter.java:450)
at
org.apache.pdfbox.pdfwriter.COSWriter.visitFromDocument(COSWriter.java:1299)
at org.apache.pdfbox.cos.COSDocument.accept(COSDocument.java:413)
at org.apache.pdfbox.pdfwriter.COSWriter.write(COSWriter.java:1568)
at
org.apache.pdfbox.pdmodel.PDDocument.saveIncremental(PDDocument.java:1078)
```
so we can skip those not define object, make it work.
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