5.1.8 Update breaks View/search clients page

After updating to 5.1.8, visiting the view/search clients page causes an error.

Fatal error: Call to undefined function db_escaoe_string() in /home/**/public_html/whmcs/admin/clients.php on line 0

I've seen several others have this same issue.

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Looks like a spelling error in the function call. db_escape_string()