diff --git a/PyPDF2/pdf.py b/PyPDF2/pdf.py
index 1bcd63eda3..449eeb78f8 100644
--- a/PyPDF2/pdf.py
+++ b/PyPDF2/pdf.py
@@ -606,7 +606,7 @@ def _sweepIndirectReferences(self, externMap, data):
                     self._sweepIndirectReferences(externMap, realdata)
                     return data
             else:
-                if data.pdf.stream.closed:
+                if hasattr(data.pdf, "stream") and data.pdf.stream.closed:
                     raise ValueError("I/O operation on closed file: {}".format(data.pdf.stream.name))
                 newobj = externMap.get(data.pdf, {}).get(data.generation, {}).get(data.idnum, None)
                 if newobj is None:
diff --git a/Tests/test_writer.py b/Tests/test_writer.py
index 7e478ca27a..22d35a6dad 100644
--- a/Tests/test_writer.py
+++ b/Tests/test_writer.py
@@ -340,3 +340,13 @@ def test_io_streams():
     writer = PdfFileWriter()
     with BytesIO() as output_stream:
         writer.write(output_stream)
+
+
+def test_regression_issue670():
+    filepath = os.path.join(RESOURCE_ROOT, "crazyones.pdf")
+    reader = PdfFileReader(filepath, strict=False, overwriteWarnings=False)
+    for _ in range(2):
+        pdf_writer = PdfFileWriter()
+        pdf_writer.addPage(reader.getPage(0))
+        with open("dont_commit_issue670.pdf", "wb") as f_pdf:
+            pdf_writer.write(f_pdf)