From 3ff9eb5f0de4cbda98392bc500ba55eb5ca8bafe Mon Sep 17 00:00:00 2001
From: kiwiwings <kiwiwings@unknown>
Date: Wed, 21 Dec 2016 22:03:54 +0000
Subject: [PATCH] Fix 0-pointer on unset document

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1775565 13f79535-47bb-0310-9956-ffa450edef68
---
 src/java/org/apache/poi/poifs/filesystem/DocumentNode.java | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/java/org/apache/poi/poifs/filesystem/DocumentNode.java b/src/java/org/apache/poi/poifs/filesystem/DocumentNode.java
index 7a5bf6900..fa49ae490 100644
--- a/src/java/org/apache/poi/poifs/filesystem/DocumentNode.java
+++ b/src/java/org/apache/poi/poifs/filesystem/DocumentNode.java
@@ -134,7 +134,9 @@ public class DocumentNode
         List<Object> components = new ArrayList<Object>();
 
         components.add(getProperty());
-        components.add(_document);
+        if (_document != null) {
+            components.add(_document);
+        }
         return components.iterator();
     }