Merge branch '3.1-stable' into develop

Conflicts resolved:
	system/core/CodeIgniter.php
	system/libraries/Cache/drivers/Cache_redis.php
	system/libraries/Session/drivers/Session_redis_driver.php
	user_guide_src/source/changelog.rst
	user_guide_src/source/conf.py
	user_guide_src/source/installation/downloads.rst
	user_guide_src/source/installation/upgrading.rst

1 files changed, 1 insertions, 1 deletions

diff --git a/system/database/drivers/pdo/pdo_result.php b/system/database/drivers/pdo/pdo_result.php
index 03c0f9f9d..b3973da46 100644
--- a/system/database/drivers/pdo/pdo_result.php
+++ b/system/database/drivers/pdo/pdo_result.php
@@ -133,7 +133,7 @@ class CI_DB_pdo_result extends CI_DB_result {
 
 				$retval[$i]			= new stdClass();
 				$retval[$i]->name		= $field['name'];
-				$retval[$i]->type		= $field['native_type'];
+				$retval[$i]->type		= isset($field['native_type']) ? $field['native_type'] : null;
 				$retval[$i]->max_length		= ($field['len'] > 0) ? $field['len'] : NULL;
 				$retval[$i]->primary_key	= (int) ( ! empty($field['flags']) && in_array('primary_key', $field['flags'], TRUE));
 			}