Can this url show a 404 as opposed to a wp error please?

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http://site/baspage/category/cat1

 

Catchable fatal error: Object of class WP_Error could not be converted to string in /home/site/public_html/wp-includes/formatting.php on line 3384

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Apparently you have WP debug enabled ?

This should not result a 404 (not found), it is a bug and should be fixed.