You fix that by doing this redirect in your .htaccess file.
You will need to change domain and tld to your site.
Code:
# permanently redirect from www domain to non-www domain
RewriteEngine on
Options +FollowSymLinks
RewriteCond %{HTTP_HOST} ^www\.domain\.tld$ [NC]
RewriteRule (.*) http://domain.tld/$1 [R=301,L]
What did you Try? What did you Get? What did you Expect?
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