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diff -rupN podofo-0.9.6/src/doc/PdfDocument.cpp podofo-0.9.6-new/src/doc/PdfDocument.cpp
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--- podofo-0.9.6/src/doc/PdfDocument.cpp 2016-11-18 20:08:56.000000000 +0100
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+++ podofo-0.9.6-new/src/doc/PdfDocument.cpp 2019-03-13 23:15:12.234138725 +0100
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@@ -325,6 +325,12 @@ const PdfDocument & PdfDocument::Append(
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for(int i=0;i<rDoc.GetPageCount();i++ )
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{
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PdfPage* pPage = rDoc.GetPage( i );
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+ if (NULL == pPage)
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+ {
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+ std::ostringstream oss;
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+ oss << "No page " << i << " (the first is 0) found.";
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+ PODOFO_RAISE_ERROR_INFO( ePdfError_PageNotFound, oss.str() );
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+ }
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PdfObject* pObj = m_vecObjects.GetObject( PdfReference( pPage->GetObject()->Reference().ObjectNumber() + difference, pPage->GetObject()->Reference().GenerationNumber() ) );
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if( pObj->IsDictionary() && pObj->GetDictionary().HasKey( "Parent" ) )
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pObj->GetDictionary().RemoveKey( "Parent" );
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