diff --git a/src/bigscreenplayer.js b/src/bigscreenplayer.js
index ae8b2945..3ebda1b6 100644
--- a/src/bigscreenplayer.js
+++ b/src/bigscreenplayer.js
@@ -110,7 +110,7 @@ function BigscreenPlayer() {
       initialPlaybackTime == null ? undefined : convertPlaybackTimeToPresentationTimeInSeconds(initialPlaybackTime)
 
     endOfStream =
-      mediaSources.time().manifestType === ManifestType.DYNAMIC &&
+      mediaSources?.time()?.manifestType === ManifestType.DYNAMIC &&
       !initialPresentationTime &&
       initialPresentationTime !== 0