Don't use error suppression on is_dir(), file_exists()
diff --git a/system/database/drivers/sqlite/sqlite_forge.php b/system/database/drivers/sqlite/sqlite_forge.php
index f80b5e7..5a28c2b 100644
--- a/system/database/drivers/sqlite/sqlite_forge.php
+++ b/system/database/drivers/sqlite/sqlite_forge.php
@@ -81,7 +81,7 @@
 	 */
 	public function drop_database($db_name = '')
 	{
-		if ( ! @file_exists($this->db->database) OR ! @unlink($this->db->database))
+		if ( ! file_exists($this->db->database) OR ! @unlink($this->db->database))
 		{
 			return ($this->db->db_debug) ? $this->db->display_error('db_unable_to_drop') : FALSE;
 		}