Undefined index: language

Notice: Undefined index: language in commerce_donate_checkout_pane_checkout_form_validate() (line 125 of /srv/www/kickstart/public_html/sites/all/modules/commerce_donate/includes/commerce_donate.checkout_pane.inc).
Notice: Undefined index: language in commerce_donate_checkout_pane_checkout_form_submit() (line 147 of /srv/www/kickstart/public_html/sites/all/modules/commerce_donate/includes/commerce_donate.checkout_pane.inc).