diff --git a/Lib/email/_parseaddr.py b/Lib/email/_parseaddr.py
index 2b28b64..c56cfd0 100644
--- a/Lib/email/_parseaddr.py
+++ b/Lib/email/_parseaddr.py
@@ -54,9 +54,8 @@
         del data[0]
     else:
         i = data[0].rfind(',')
-        if i < 0:
-            return None
-        data[0] = data[0][i+1:]
+        if i >= 0:
+            data[0] = data[0][i+1:]
     if len(data) == 3: # RFC 850 date, deprecated
         stuff = data[0].split('-')
         if len(stuff) == 3: