From 38fb184e384770c03461f653c96c66d537fbb9e3 Mon Sep 17 00:00:00 2001
From: sastra winarta <winartasa@gmail.com>
Date: Mon, 25 Dec 2017 10:33:27 +0800
Subject: [PATCH] Update WebSocketServer.java

---
 src/main/java/org/java_websocket/server/WebSocketServer.java | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/main/java/org/java_websocket/server/WebSocketServer.java b/src/main/java/org/java_websocket/server/WebSocketServer.java
index bb17fa4e9..62c618c09 100644
--- a/src/main/java/org/java_websocket/server/WebSocketServer.java
+++ b/src/main/java/org/java_websocket/server/WebSocketServer.java
@@ -254,7 +254,7 @@ public void stop( int timeout ) throws InterruptedException {
 
 		synchronized ( this ) {
 			if( selectorthread != null  ) {
-				selector.wakeup();
+				if(selector != null) selector.wakeup();
 				selectorthread.join( timeout );
 			}
 		}