diff --git a/pdfplumber/convert.py b/pdfplumber/convert.py
index 5c285d0..9abfc87 100644
--- a/pdfplumber/convert.py
+++ b/pdfplumber/convert.py
@@ -109,8 +109,8 @@ class Serializer:
         else:
             return {k: self.serialize(v) for k, v in obj.items()}
 
-    def do_PDFStream(self, obj: Any) -> Dict[str, str]:
-        return {"rawdata": to_b64(obj.rawdata)}
+    def do_PDFStream(self, obj: Any) -> Dict[str, Optional[str]]:
+        return {"rawdata": to_b64(obj.rawdata) if obj.rawdata else None}
 
     def do_PSLiteral(self, obj: PSLiteral) -> str:
         return decode_text(obj.name)
diff --git a/tests/pdfs/from-oss-fuzz/load/4927662560968704.pdf b/tests/pdfs/from-oss-fuzz/load/4927662560968704.pdf
new file mode 100644
index 0000000..629f32e
Binary files /dev/null and b/tests/pdfs/from-oss-fuzz/load/4927662560968704.pdf differ