diff --git a/src/components/playback/playbackmanager.js b/src/components/playback/playbackmanager.js
index 587705b1f8..6d95f4b9a2 100644
--- a/src/components/playback/playbackmanager.js
+++ b/src/components/playback/playbackmanager.js
@@ -2387,7 +2387,11 @@ class PlaybackManager {
                 console.debug(`AutoSet ${streamType} - Using ${bestStreamIndex} score ${bestStreamScore}.`);
                 if (streamType == 'Subtitle') {
                     if (isSecondarySubtitle) {
-                        mediaSource.DefaultSecondarySubtitleStreamIndex = bestStreamIndex;
+                        if (self.trackHasSecondarySubtitleSupport(mediaSource.MediaStreams[bestStreamIndex])) {
+                            mediaSource.DefaultSecondarySubtitleStreamIndex = bestStreamIndex;
+                        } else {
+                            mediaSource.DefaultSecondarySubtitleStreamIndex = -1;
+                        }
                     } else {
                         mediaSource.DefaultSubtitleStreamIndex = bestStreamIndex;
                     }