Ticket #40810: 40810.patch

src/wp-includes/pluggable.php

@@ -327 +327 @@
 
         if ( !isset( $from_email ) ) {
                 // Get the site domain and get rid of www.
-                $sitename = strtolower( $_SERVER['SERVER_NAME'] );
+                // If SERVER_NAME is not available, hostname will be used.
+                if ( !empty ( $_SERVER['SERVER_NAME'] ) ) {
+                    $sitename = strtolower( $_SERVER['SERVER_NAME'] );
+                } else {
+                    $sitename = strtolower( php_uname( 'n' ));
+                }
                 if ( substr( $sitename, 0, 4 ) == 'www.' ) {
                         $sitename = substr( $sitename, 4 );
                 }