diff --git a/app/src/main/java/com/futo/platformplayer/fragment/mainactivity/main/VideoDetailView.kt b/app/src/main/java/com/futo/platformplayer/fragment/mainactivity/main/VideoDetailView.kt
index c90c1da6..909a654f 100644
--- a/app/src/main/java/com/futo/platformplayer/fragment/mainactivity/main/VideoDetailView.kt
+++ b/app/src/main/java/com/futo/platformplayer/fragment/mainactivity/main/VideoDetailView.kt
@@ -2384,8 +2384,8 @@ class VideoDetailView : ConstraintLayout {
     }
 
     fun isLandscapeVideo(): Boolean? {
-        var videoSourceWidth = _player.exoPlayer?.player?.videoSize?.width
-        var videoSourceHeight = _player.exoPlayer?.player?.videoSize?.height
+        val videoSourceWidth = _player.exoPlayer?.player?.videoSize?.width
+        val videoSourceHeight = _player.exoPlayer?.player?.videoSize?.height
 
         return if (videoSourceWidth == null || videoSourceHeight == null || videoSourceWidth == 0 || videoSourceHeight == 0){
             null
diff --git a/app/src/main/java/com/futo/platformplayer/views/video/FutoVideoPlayer.kt b/app/src/main/java/com/futo/platformplayer/views/video/FutoVideoPlayer.kt
index 8767031e..740740fa 100644
--- a/app/src/main/java/com/futo/platformplayer/views/video/FutoVideoPlayer.kt
+++ b/app/src/main/java/com/futo/platformplayer/views/video/FutoVideoPlayer.kt
@@ -592,6 +592,11 @@ class FutoVideoPlayer : FutoVideoPlayerBase {
 
     @OptIn(UnstableApi::class)
     fun setFullScreen(fullScreen: Boolean) {
+        // prevent fullscreen before the video has loaded to make sure we know whether it's a vertical or horizontal video
+        if(exoPlayer?.player?.videoSize?.height ?: 0 == 0 && fullScreen){
+            return
+        }
+
         updateRotateLock()
 
         if (isFullScreen == fullScreen) {