From b29f5e1567af5b4bc6744a12d9c3465c6ec63890 Mon Sep 17 00:00:00 2001
From: Peter Reilly <peterreilly@apache.org>
Date: Fri, 4 May 2007 16:14:49 +0000
Subject: [PATCH] Bugzilla 42334: System properties may be none string objects

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@535312 13f79535-47bb-0310-9956-ffa450edef68
---
 src/main/org/apache/tools/ant/Project.java | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/main/org/apache/tools/ant/Project.java b/src/main/org/apache/tools/ant/Project.java
index d56f36d15..ef89ffc89 100644
--- a/src/main/org/apache/tools/ant/Project.java
+++ b/src/main/org/apache/tools/ant/Project.java
@@ -910,7 +910,9 @@ public class Project implements ResourceFactory {
         while (e.hasMoreElements()) {
             String propertyName = (String) e.nextElement();
             String value = systemP.getProperty(propertyName);
-            this.setPropertyInternal(propertyName, value);
+            if (value != null) {
+                this.setPropertyInternal(propertyName, value);
+            }
         }
     }