diff --git a/system/database/drivers/odbc/odbc_driver.php b/system/database/drivers/odbc/odbc_driver.php
index a6e3dd7..2217e97 100644
--- a/system/database/drivers/odbc/odbc_driver.php
+++ b/system/database/drivers/odbc/odbc_driver.php
@@ -263,11 +263,11 @@
 	/**
 	 * Insert ID
 	 *
-	 * @return	int
+	 * @return	bool
 	 */
 	public function insert_id()
 	{
-		return @odbc_insert_id($this->conn_id);
+		return ($this->db->db_debug) ? $this->db->display_error('db_unsuported_feature') : FALSE;
 	}
 
 	// --------------------------------------------------------------------
diff --git a/user_guide_src/source/changelog.rst b/user_guide_src/source/changelog.rst
index b3b81a3..45e6bfc 100644
--- a/user_guide_src/source/changelog.rst
+++ b/user_guide_src/source/changelog.rst
@@ -138,6 +138,7 @@
 -  Fixed a bug in Oracle's :doc:`Database Forge Class <database/forge>` method _create_table() where it failed with AUTO_INCREMENT as it's not supported.
 -  Fixed a bug (#1080) - When using the SMTP protocol, the :doc:`Email Library <libraries/email>` send() method was returning TRUE even if the connection/authentication against the server failed.
 -  Fixed a bug (#499) - a CSRF cookie was created even with CSRF protection being disabled.
+-  Fixed a bug (#306) - ODBC's insert_id() method was calling non-existent function odbc_insert_id(), which resulted in a fatal error.
 
 Version 2.1.1
 =============