From 3300dfae600bf2c7bdc690dd974ce0f413b38128 Mon Sep 17 00:00:00 2001
From: Christophe Bol <bol.christophe@gmail.com>
Date: Mon, 1 Dec 2014 15:34:09 +0100
Subject: [PATCH] fixed error when logging from the clustered master

---
 lib/layouts.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/layouts.js b/lib/layouts.js
index be5681c..1a1f094 100644
--- a/lib/layouts.js
+++ b/lib/layouts.js
@@ -213,7 +213,7 @@ function patternLayout (pattern, tokens) {
   }
 
   function pid(loggingEvent) {
-    if (loggingEvent.pid) {
+    if (loggingEvent && loggingEvent.pid) {
       return loggingEvent.pid;
     } else {
       return process.pid;