From 5cd8869646b0391cd26a194564772d0c64587df0 Mon Sep 17 00:00:00 2001
From: baiming <baiming@google.com>
Date: Fri, 24 Nov 2017 01:32:44 -0800
Subject: [PATCH] Really fix the NPE in ExoPlayer.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=176821463
---
 .../android/exoplayer2/ExoPlayerImplInternal.java      | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/library/core/src/main/java/com/google/android/exoplayer2/ExoPlayerImplInternal.java b/library/core/src/main/java/com/google/android/exoplayer2/ExoPlayerImplInternal.java
index 8895b8e03a..4e37211e80 100644
--- a/library/core/src/main/java/com/google/android/exoplayer2/ExoPlayerImplInternal.java
+++ b/library/core/src/main/java/com/google/android/exoplayer2/ExoPlayerImplInternal.java
@@ -947,10 +947,12 @@ import java.io.IOException;
     MediaPeriodHolder periodHolder =
         playingPeriodHolder != null ? playingPeriodHolder : loadingPeriodHolder;
     while (periodHolder != null) {
-      TrackSelection[] trackSelections = periodHolder.trackSelectorResult.selections.getAll();
-      for (TrackSelection trackSelection : trackSelections) {
-        if (trackSelection != null) {
-          trackSelection.onPlaybackSpeed(playbackSpeed);
+      if (periodHolder.trackSelectorResult != null) {
+        TrackSelection[] trackSelections = periodHolder.trackSelectorResult.selections.getAll();
+        for (TrackSelection trackSelection : trackSelections) {
+          if (trackSelection != null) {
+            trackSelection.onPlaybackSpeed(playbackSpeed);
+          }
         }
       }
       periodHolder = periodHolder.next;