From 83d0914145e12d532f2790b6a887723fb37fd112 Mon Sep 17 00:00:00 2001
From: Eric House <xwords@eehouse.org>
Date: Tue, 4 Dec 2018 19:59:42 -0800
Subject: [PATCH] fix NPE

It happened when too many timers were firing, but I think this code's
better anyway.
---
 .../java/org/eehouse/android/xw4/BTService.java   | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/xwords4/android/app/src/main/java/org/eehouse/android/xw4/BTService.java b/xwords4/android/app/src/main/java/org/eehouse/android/xw4/BTService.java
index 530e658fe..ec463e3a1 100644
--- a/xwords4/android/app/src/main/java/org/eehouse/android/xw4/BTService.java
+++ b/xwords4/android/app/src/main/java/org/eehouse/android/xw4/BTService.java
@@ -1131,13 +1131,16 @@ public class BTService extends XWService {
 
     private void stopListener()
     {
-        m_listener.stopListening();
-        try {
-            m_listener.join( 100 );
-        } catch ( InterruptedException ie ) {
-            Log.ex( TAG, ie );
+        BTListenerThread listener = m_listener;
+        if ( listener != null ) {
+            m_listener = null;
+            listener.stopListening();
+            try {
+                listener.join( 100 );
+            } catch ( InterruptedException ie ) {
+                Log.ex( TAG, ie );
+            }
         }
-        m_listener = null;
     }
 
     private void stopSender()