From de6e6806155bdc1358a62db3c62007102c342ddd Mon Sep 17 00:00:00 2001
From: wusheng <wu.sheng@foxmail.com>
Date: Fri, 3 Mar 2017 16:11:53 +0800
Subject: [PATCH] Fix NullPointException

---
 .../src/main/java/com/a/eye/skywalking/trace/TraceSegment.java | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/skywalking-commons/skywalking-trace/src/main/java/com/a/eye/skywalking/trace/TraceSegment.java b/skywalking-commons/skywalking-trace/src/main/java/com/a/eye/skywalking/trace/TraceSegment.java
index 56b1727d17..b833859302 100644
--- a/skywalking-commons/skywalking-trace/src/main/java/com/a/eye/skywalking/trace/TraceSegment.java
+++ b/skywalking-commons/skywalking-trace/src/main/java/com/a/eye/skywalking/trace/TraceSegment.java
@@ -158,6 +158,9 @@ public class TraceSegment implements ISerializable<SegmentMessage> {
     }
 
     public List<TraceSegmentRef> getRefs() {
+        if(refs == null){
+            return null;
+        }
         return Collections.unmodifiableList(refs);
     }
 
-- 
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