diff --git a/kmip/services/server/session.py b/kmip/services/server/session.py
index 85fba68..545ea9c 100644
--- a/kmip/services/server/session.py
+++ b/kmip/services/server/session.py
@@ -127,7 +127,7 @@ class KmipSession(threading.Thread):
         )
 
         try:
-            if hasattr(self._connection, 'shared_ciphers'):
+            if hasattr(self._connection, 'shared_ciphers') and self._connection.shared_ciphers() is not None:
                 shared_ciphers = self._connection.shared_ciphers()
                 self._logger.debug(
                     "Possible session ciphers: {0}".format(len(shared_ciphers))