Index: src/wp-admin/includes/ms.php
===================================================================
--- src/wp-admin/includes/ms.php	(revision 33563)
+++ src/wp-admin/includes/ms.php	(working copy)
@@ -298,6 +298,7 @@
 	 */
 	$content = apply_filters( 'new_admin_email_content', $email_text, $new_admin_email );
 
+	$current_user = wp_get_current_user();
 	$content = str_replace( '###USERNAME###', $current_user->user_login, $content );
 	$content = str_replace( '###ADMIN_URL###', esc_url( admin_url( 'options.php?adminhash='.$hash ) ), $content );
 	$content = str_replace( '###EMAIL###', $value, $content );