diff --git a/Lib/ssl.py b/Lib/ssl.py
index 560cfef..5fe1432 100644
--- a/Lib/ssl.py
+++ b/Lib/ssl.py
@@ -701,7 +701,7 @@ class SSLSocket(socket):
             self.ciphers = ciphers
         # Can't use sock.type as other flags (such as SOCK_NONBLOCK) get
         # mixed in.
-        if sock.getsockopt(SOL_SOCKET, SO_TYPE) != SOCK_STREAM:
+        if sock is not None and sock.getsockopt(SOL_SOCKET, SO_TYPE) != SOCK_STREAM:
             raise NotImplementedError("only stream sockets are supported")
         if server_side and server_hostname:
             raise ValueError("server_hostname can only be specified "