diff --git a/serviceframework-web/src/main/java/net/csdn/modules/http/HttpServer.java b/serviceframework-web/src/main/java/net/csdn/modules/http/HttpServer.java
index 19cf1e8..9b7baf9 100644
--- a/serviceframework-web/src/main/java/net/csdn/modules/http/HttpServer.java
+++ b/serviceframework-web/src/main/java/net/csdn/modules/http/HttpServer.java
@@ -225,18 +225,22 @@ public void run() {
     }
 
     public void close() {
-        try {
-            server.stop();
-        } catch (Exception e) {
-            e.printStackTrace();
+        if (server != null) {
+            try {
+                server.stop();
+            } catch (Exception e) {
+                e.printStackTrace();
+            }
         }
     }
 
     public void join() {
-        try {
-            server.join();
-        } catch (InterruptedException e) {
-            e.printStackTrace();
+        if (server != null) {
+            try {
+                server.join();
+            } catch (InterruptedException e) {
+                e.printStackTrace();
+            }
         }
     }