Error: Opencart\System\Library\Document::addLink(): Argument #1 ($href) must be of type string, null given, called in /home/opusoak/public_html/extension/huntbee_seo_canonical/catalog/model/module/hb_canonical.php on line 94
File: /home/opusoak/public_html/system/library/document.php
Line: 111

Backtrace: 0
File: /home/opusoak/public_html/extension/huntbee_seo_canonical/catalog/model/module/hb_canonical.php
Line: 94
Class: Opencart\System\Library\Document
Function: addLink

Backtrace: 1
File: /home/opusoak/public_html/system/engine/loader.php
Line: 343
Class: Opencart\Catalog\Model\Extension\HuntbeeSeoCanonical\Module\HbCanonical
Function: product_canonical

Backtrace: 2
File: /home/opusoak/public_html/system/engine/proxy.php
Line: 87
Class: Opencart\System\Engine\Loader
Function: Opencart\System\Engine\{closure}

Backtrace: 3
File: /home/opusoak/public_html/extension/ocmod/catalog/controller/product/product.php
Line: 244
Class: Opencart\System\Engine\Proxy
Function: __call

Backtrace: 4
File: /home/opusoak/public_html/system/engine/action.php
Line: 96
Class: Opencart\Catalog\Controller\Product\Product
Function: index

Backtrace: 5
File: /home/opusoak/public_html/system/framework.php
Line: 259
Class: Opencart\System\Engine\Action
Function: execute

Backtrace: 6
File: /home/opusoak/public_html/index.php
Line: 20
Function: require_once