diff --git a/testutils/src/main/java/com/google/android/exoplayer2/testutil/StubPlayer.java b/testutils/src/main/java/com/google/android/exoplayer2/testutil/StubPlayer.java
index 9891f7d677..e4e04b4fd3 100644
--- a/testutils/src/main/java/com/google/android/exoplayer2/testutil/StubPlayer.java
+++ b/testutils/src/main/java/com/google/android/exoplayer2/testutil/StubPlayer.java
@@ -68,6 +68,7 @@ public class StubPlayer extends BasePlayer {
   }
 
   @Override
+  @Nullable
   public PlaybackException getPlayerError() {
     throw new UnsupportedOperationException();
   }