A PHP Error was encountered

Severity: Notice

Message: Undefined variable: product_id

Filename: models/Model_frontend.php

Line Number: 1904

Backtrace:

File: /home/nadz/domains/nadzproject.com/public_html/application/modules/frontend/models/Model_frontend.php
Line: 1904
Function: _error_handler

File: /home/nadz/domains/nadzproject.com/public_html/application/modules/frontend/controllers/Path.php
Line: 1005
Function: getPromotionAllIsProductId

File: /home/nadz/domains/nadzproject.com/public_html/index.php
Line: 317
Function: require_once