diff --git a/classes/db/DB.class.php b/classes/db/DB.class.php
index 244f73f1d..3e7249dce 100644
--- a/classes/db/DB.class.php
+++ b/classes/db/DB.class.php
@@ -902,7 +902,7 @@ class DB
 	 */
 	public function _dbInfoExists()
 	{
-		return ($this->master_db && count($this->slave_db));
+		return ($this->master_db && (is_countable($this->slave_db) && count($this->slave_db)));
 	}
 
 	/**