From ae30fe496aa11e5af28625953c7048975a2ef884 Mon Sep 17 00:00:00 2001
From: olly <olly@google.com>
Date: Wed, 4 Jan 2017 06:59:38 -0800
Subject: [PATCH] Fix potential NPE if source is released without being
 prepared

Issue: #2264

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=143550088
---
 .../android/exoplayer2/source/hls/HlsMediaSource.java       | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/library/src/main/java/com/google/android/exoplayer2/source/hls/HlsMediaSource.java b/library/src/main/java/com/google/android/exoplayer2/source/hls/HlsMediaSource.java
index 869efa6cdc..b7195cb79d 100644
--- a/library/src/main/java/com/google/android/exoplayer2/source/hls/HlsMediaSource.java
+++ b/library/src/main/java/com/google/android/exoplayer2/source/hls/HlsMediaSource.java
@@ -94,8 +94,10 @@ public final class HlsMediaSource implements MediaSource,
 
   @Override
   public void releaseSource() {
-    playlistTracker.release();
-    playlistTracker = null;
+    if (playlistTracker != null) {
+      playlistTracker.release();
+      playlistTracker = null;
+    }
     sourceListener = null;
   }