Ignore the state returned by __reduce__ if it is Py_None.
diff --git a/Modules/cPickle.c b/Modules/cPickle.c
index 24a9f13..08bb8e8 100644
--- a/Modules/cPickle.c
+++ b/Modules/cPickle.c
@@ -2086,6 +2086,8 @@
 
 		if (size > 2) {
 			state = PyTuple_GET_ITEM(t, 2);
+			if (state == Py_None)
+				state = NULL;
 		}
 
 		if (!( PyTuple_Check(arg_tup) || arg_tup==Py_None ))  {