If attempting to write an empty session to Redis, a key will not actually be created, so when the driver tries to set the expiration timeout on the key, 0 is returned, triggering a warning from session_write_close

Signed-off-by: Jonty Sewell <jontysewell@gmail.com>

1 files changed, 9 insertions, 3 deletions

diff --git a/system/libraries/Session/drivers/Session_redis_driver.php b/system/libraries/Session/drivers/Session_redis_driver.php
index c7c574202..aa8459bef 100644
--- a/system/libraries/Session/drivers/Session_redis_driver.php
+++ b/system/libraries/Session/drivers/Session_redis_driver.php
@@ -240,9 +240,15 @@ class CI_Session_redis_driver extends CI_Session_driver implements SessionHandle
 				return $this->_failure;
 			}
 
-			return ($this->_redis->setTimeout($this->_key_prefix.$session_id, $this->_config['expiration']))
-				? $this->_success
-				: $this->_failure;
+			if($this->_fingerprint === md5(''))
+			{
+				// A blank session will not be written to redis, so a timeout cannot be set on it
+				return $this->_success;
+			} else {
+				return ($this->_redis->setTimeout($this->_key_prefix.$session_id, $this->_config['expiration']))
+					? $this->_success
+					: $this->_failure;
+			}
 		}
 
 		return $this->_failure;