2 files changed, 5 insertions, 1 deletions
diff --git a/Lib/test/test_traceback.py b/Lib/test/test_traceback.py
index b3c5a50..b42dbc4 100644
--- a/Lib/test/test_traceback.py
+++ b/Lib/test/test_traceback.py
@@ -149,6 +149,10 @@ def test():
         str_value = '<unprintable %s object>' % X.__name__
         self.assertEqual(err[0], X.__name__ + ': ' + str_value + '\n')
 
+    def test_without_exception(self):
+        err = traceback.format_exception_only(None, None)
+        self.assertEqual(err, ['None\n'])
+
 
 def test_main():
     run_unittest(TracebackCases)
diff --git a/Lib/traceback.py b/Lib/traceback.py
index 75e1fcf..31b8255 100644
--- a/Lib/traceback.py
+++ b/Lib/traceback.py
@@ -170,7 +170,7 @@ def format_exception_only(etype, value):
     # would throw another exception and mask the original problem.
     if (isinstance(etype, BaseException) or
         isinstance(etype, types.InstanceType) or
-        type(etype) is str):
+        etype is None or type(etype) is str):
         return [_format_final_exc_line(etype, value)]
 
     stype = etype.__name__