Fatal Error in 7.1.9.3 on line 454 of wp-contact-form-7.php on new installation

After installing the plugin on a new site, I received the following error when accessing the admin page.


Fatal error: Cannot use string offset as an array in /[My Plugin Path]/contact-form-7/wp-contact-form-7.php on line 454


I fixed the problem with the following patch to function management_page()

Replace starting on Line 715

} else {
$current = (int) array_shift(array_keys($contact_forms));
$cf = stripslashes_deep($contact_forms[$current]);
$cf = $this->upgrade($cf);
}

With

} else {
$current = (int) array_shift(array_keys($contact_forms));
$cf = stripslashes_deep($contact_forms[$current]);
if ($cf != "") // handle empy form
$cf = $this->upgrade($cf);
}