Couple of days ago , everything is fine.
I didn't touch anything but today , I noticed all of my product page source code missing the "<link rel="canonical"
So I went to /includes/templates/My Template/common/html_header.php to check, the code is right there:
<?php if (isset($canonicalLink) && $canonicalLink != '') { ?>
<link rel="canonical" href="<?php echo $canonicalLink; ?>" />
<?php } ?>
Can anybody tell me what makes the canonical missing in product page code?
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