From 58280f979ee07a0fc30ed39a6e898f4966a7d901 Mon Sep 17 00:00:00 2001
From: andrewlewis <andrewlewis@google.com>
Date: Mon, 12 Jun 2017 03:49:12 -0700
Subject: [PATCH] Fix continueLoading in IMA deferred periods

continueLoading may be called during preparation, but this is not
handled correctly in the case where a deferred period doesn't
have a source yet.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=158696539
---
 .../google/android/exoplayer2/ext/ima/ImaAdsMediaSource.java    | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/extensions/ima/src/main/java/com/google/android/exoplayer2/ext/ima/ImaAdsMediaSource.java b/extensions/ima/src/main/java/com/google/android/exoplayer2/ext/ima/ImaAdsMediaSource.java
index 8e8c5aca19..00bd81d754 100644
--- a/extensions/ima/src/main/java/com/google/android/exoplayer2/ext/ima/ImaAdsMediaSource.java
+++ b/extensions/ima/src/main/java/com/google/android/exoplayer2/ext/ima/ImaAdsMediaSource.java
@@ -506,7 +506,7 @@ public final class ImaAdsMediaSource implements MediaSource {
 
     @Override
     public boolean continueLoading(long positionUs) {
-      return mediaPeriod.continueLoading(positionUs);
+      return mediaPeriod != null && mediaPeriod.continueLoading(positionUs);
     }
 
     // MediaPeriod.Callback implementation.