PHP Notice in CF7DBPlugin::saveFormData()

PHP Notice: Undefined property: WPCF7_ContactForm::$user in /var/www/projects/wordpress/wp-content/plugins/contact-form-7-to-database-extension/CF7DBPlugin.php on line 490

Looks like $cf7->user is only set if the user is logged in. You can fix this by moving the assignment down 1 line:

--- CF7DBPlugin.php.old
+++ CF7DBPlugin.php.new
@@ -479,8 +479,8 @@
             if (is_user_logged_in()) {
                 $current_user = wp_get_current_user(); // WP_User
                 $user = $current_user->user_login;
-                $cf7->user = $user;
-            }
+            }
+            $cf7->user = $user;
             try {
                 $newCf7 = apply_filters('cfdb_form_data', $cf7);
                 if ($newCf7 && is_object($newCf7)) {

As there’s a filter (thanks!), I’ve currently worked around this like this:

add_filter('cfdb_form_data', function($formData) {
    // fix for PHP notice
    // Undefined property: WPCF7_ContactForm::$user in /wp-content/plugins/contact-form-7-to-database-extension/CF7DBPlugin.php on line 490
    if (!empty($formData) && is_object($formData) && !isset($formData->user)) {
        $formData->user = null;
    }
});

http://wordpress.org/extend/plugins/contact-form-7-to-database-extension/