.

1 files changed, 1 insertions, 0 deletions

diff --git a/redis/client.py b/redis/client.py
index f4806dc..0b8bf8c 100755
--- a/redis/client.py
+++ b/redis/client.py
@@ -2521,6 +2521,7 @@ class PubSub(object):
         """
         Ping the Redis server
         """
+        message = '' if message is None else message
         return self.execute_command('PING', message)
 
     def handle_message(self, response, ignore_subscribe_messages=False):