diff --git a/library/core/src/main/java/com/google/android/exoplayer2/MediaPeriodQueue.java b/library/core/src/main/java/com/google/android/exoplayer2/MediaPeriodQueue.java
index d595564744..e97c3ee489 100644
--- a/library/core/src/main/java/com/google/android/exoplayer2/MediaPeriodQueue.java
+++ b/library/core/src/main/java/com/google/android/exoplayer2/MediaPeriodQueue.java
@@ -744,6 +744,7 @@ import com.google.android.exoplayer2.util.Assertions;
       long startPositionUs,
       long requestedContentPositionUs,
       long windowSequenceNumber) {
+    timeline.getPeriodByUid(periodUid, period);
     int nextAdGroupIndex = period.getAdGroupIndexAfterPositionUs(startPositionUs);
     MediaPeriodId id = new MediaPeriodId(periodUid, windowSequenceNumber, nextAdGroupIndex);
     boolean isLastInPeriod = isLastInPeriod(id);