Additional uncaught exception thrown while handling exception.

Original

RedisException: read error on connection to redis-master:6379 in Redis->auth() (line 18 of /var/www/html/sites/all/modules/redis/lib/Redis/Client/PhpRedis.php).

Additional

RedisException: Connection refused in Redis->connect() (line 14 of /var/www/html/sites/all/modules/redis/lib/Redis/Client/PhpRedis.php).