diff --git a/CHANGELOG b/CHANGELOG
index 10ab4443e..0b46ea6f4 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -56,6 +56,7 @@ Version 1.1.14 work in progress
 - Bug #2426: CDbCriteria::__wakeup() used to issue an error in case SQL containing fields were arrays and criteria parameters were specified (resurtm)
 - Bug #2449: CSqlDataProvider causes an error when CDbCommand with enabled PDO::FETCH_OBJ mode used as SQL source (resurtm)
 - Bug #2454: Fix CMysqlColumnSchema::extractLimit for ENUM values containing comma (blueyed)
+- Bug #2491: Prevent SQL exception being thrown when inserting a row into the session table whilst regenerating the session ID (mynameiszanders)
 - Enh: Better CFileLogRoute performance (Qiang, samdark)
 - Enh: Refactored CHttpRequest::getDelete and CHttpRequest::getPut not to use _restParams directly (samdark)
 - Enh #118: Proper support of namespaced models in forms (LastDragon-ru, Ekstazi, pgaultier)
diff --git a/framework/web/CDbHttpSession.php b/framework/web/CDbHttpSession.php
index c61db5c3b..f84f20f0f 100644
--- a/framework/web/CDbHttpSession.php
+++ b/framework/web/CDbHttpSession.php
@@ -126,6 +126,7 @@ class CDbHttpSession extends CHttpSession
 			$db->createCommand()->insert($this->sessionTableName, array(
 				'id'=>$newID,
 				'expire'=>time()+$this->getTimeout(),
+                'data'=>'',
 			));
 		}
 	}