From 785c4236c3890ffb366222cede9832b7afc80321 Mon Sep 17 00:00:00 2001
From: hxy1991 <cannel_2020@163.com>
Date: Fri, 10 Aug 2018 16:30:20 +0800
Subject: [PATCH] Fixed #28

---
 .../alibaba/nacos/config/server/service/ConfigSubService.java | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/config/src/main/java/com/alibaba/nacos/config/server/service/ConfigSubService.java b/config/src/main/java/com/alibaba/nacos/config/server/service/ConfigSubService.java
index 296542a62ec..81f47d776c9 100644
--- a/config/src/main/java/com/alibaba/nacos/config/server/service/ConfigSubService.java
+++ b/config/src/main/java/com/alibaba/nacos/config/server/service/ConfigSubService.java
@@ -124,7 +124,9 @@ private List<SampleResult> runCollectionJob(String url, Map<String, String> para
 										ipList.get(i));
 					}
 				} catch (TimeoutException e) {
-					f.cancel(true);
+					if (f != null) {
+						f.cancel(true);
+					}
 					LogUtil.defaultLog.warn(
 							"get task result with TimeoutException: {} ", e
 									.getMessage());