wrong sql-call during install

install/lib/installer_base.lib.php

@@ -235,7 +235,7 @@ class installer_base {
 		}
 
 		$unwanted_sql_plugins = array('validate_password');		
-		$sql_plugins = $inst->db->queryAllRecords("SELECT plugin_name FROM information_schema.plugins WHERE plugin_status='ACTIVE' AND plugin_name IN ?", $unwanted_sql_plugins);
+		$sql_plugins = $this->db->queryAllRecords("SELECT plugin_name FROM information_schema.plugins WHERE plugin_status='ACTIVE' AND plugin_name IN ?", $unwanted_sql_plugins);
 		if(is_array($sql_plugins) && !empty($sql_plugins)) {
 			foreach ($sql_plugins as $plugin) echo "Login in to MySQL and disable $plugin[plugin_name] with:\n\n    UNINSTALL PLUGIN $plugin[plugin_name];";
 			die();