diff --git a/ChangeLog b/ChangeLog
index cdd64ee3..4c8c61b7 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,9 @@
 2020-10-31  Jay Berkenbilt  <ejb@ql.org>
 
+	* Don't enter extension initialization in QPDFWriter on a direct
+	object. Fixes stack overflow in pathological case of /Root being a
+	direct object (fuzz issue 26761).
+
 	* My previous fix to #449 (handling foreign streams with indirect
 	objects in /Filter and/or /DecodeParms) was incorrect and caused
 	other problems. There is a now a correct fix to the original
diff --git a/fuzz/qpdf_extra/26761.fuzz b/fuzz/qpdf_extra/26761.fuzz
new file mode 100644
index 00000000..c565895c
Binary files /dev/null and b/fuzz/qpdf_extra/26761.fuzz differ
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") &&