Using ver. 1.2.2, I received this php error after activating another theme (which maybe had nothing to do with the error?):
Notice: Undefined index: title-page in /home/seedwork/public_html/wp-content/plugins/wordpress-seo/inc/wpseo-non-ajax-functions.php on line 297 Warning: Cannot modify header information - headers already sent by (output started at /home/xxxxxx/public_html/wp-content/plugins/wordpress-seo/inc/wpseo-non-ajax-functions.php:297) in /home/xxxxxx/public_html/wp-includes/pluggable.php on line 881
Luckily I'm developing a site and not using this in production.