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-rw-r--r--libqpdf/QPDFWriter.cc3
1 files changed, 2 insertions, 1 deletions
diff --git a/libqpdf/QPDFWriter.cc b/libqpdf/QPDFWriter.cc
index ba19cbb9..fcf272f6 100644
--- a/libqpdf/QPDFWriter.cc
+++ b/libqpdf/QPDFWriter.cc
@@ -1537,7 +1537,8 @@ QPDFWriter::unparseObject(QPDFObjectHandle object, int level,
bool have_extensions_adbe = false;
QPDFObjectHandle extensions;
- if (old_og == this->m->pdf.getRoot().getObjGen())
+ if ((old_og.getObj() != 0) &&
+ (old_og == this->m->pdf.getRoot().getObjGen()))
{
is_root = true;
if (object.hasKey("/Extensions") &&