diff -r 59621d4f1171 Lib/ftplib.py
--- a/Lib/ftplib.py	Mon Mar 18 00:21:43 2013 -0400
+++ b/Lib/ftplib.py	Sun Mar 17 20:06:48 2013 -1000
@@ -440,7 +440,7 @@
                     break
                 callback(data)
             # shutdown ssl layer
-            if isinstance(conn, _SSLSocket):
+            if _SSLSocket is not None and isinstance(conn, _SSLSocket):
                 conn.unwrap()
         return self.voidresp()
 
@@ -473,7 +473,7 @@
                     line = line[:-1]
                 callback(line)
             # shutdown ssl layer
-            if isinstance(conn, _SSLSocket):
+            if _SSLSocket is not None and isinstance(conn, _SSLSocket):
                 conn.unwrap()
         return self.voidresp()
 
@@ -502,7 +502,7 @@
                 if callback:
                     callback(buf)
             # shutdown ssl layer
-            if isinstance(conn, _SSLSocket):
+            if _SSLSocket is not None and isinstance(conn, _SSLSocket):
                 conn.unwrap()
         return self.voidresp()
 
@@ -531,7 +531,7 @@
                 if callback:
                     callback(buf)
             # shutdown ssl layer
-            if isinstance(conn, _SSLSocket):
+            if _SSLSocket is not None and isinstance(conn, _SSLSocket):
                 conn.unwrap()
         return self.voidresp()