thanks to dear member @sarisan updated 4SEO - joomla seo plugin with a new update entry:
2.1.0.1569
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2.1.0.1569
new- Dynamically compute canonical link for com_content articles and category pages instead of relying on first-found page to be the canonical.
chg- Errors during sh404SEF metadata and redirects import are now caught and logged to file, before any error would stop the import process
chg- Refactored sh404SEF metadata and redirects import to share mode code
chg- Added protection against 3rd-party extensions causing fatal errors when rendering a 4SEO error page
chg- Can now bypass nofollow meta...
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