diff --git a/system/libraries/Session/drivers/Session_database_driver.php b/system/libraries/Session/drivers/Session_database_driver.php
index 76c1cf3..1d01c29 100644
--- a/system/libraries/Session/drivers/Session_database_driver.php
+++ b/system/libraries/Session/drivers/Session_database_driver.php
@@ -93,6 +93,10 @@
 		{
 			throw new Exception('Configured database connection is persistent. Aborting.');
 		}
+		elseif ($this->_db->cache_on)
+		{
+			throw new Exception('Configured database connection has cache enabled. Aborting.');
+		}
 
 		$db_driver = $this->_db->dbdriver.(empty($this->_db->subdriver) ? '' : '_'.$this->_db->subdriver);
 		if (strpos($db_driver, 'mysql') !== FALSE)
diff --git a/user_guide_src/source/libraries/sessions.rst b/user_guide_src/source/libraries/sessions.rst
index 2317f85..54655ff 100644
--- a/user_guide_src/source/libraries/sessions.rst
+++ b/user_guide_src/source/libraries/sessions.rst
@@ -569,9 +569,10 @@
 
   - Only your **default** database connection (or the one that you access
     as ``$this->db`` from your controllers) can be used.
-  - You can NOT use a persistent connection.
   - You must have the :doc:`Query Builder </database/query_builder>`
     enabled.
+  - You can NOT use a persistent connection.
+  - You can NOT use a connection with the *cache_on* setting enabled.
 
 In order to use the 'database' session driver, you must also create this
 table that we already mentioned and then set it as your