Fix IOS embed player

client/src/standalone/videos/embed.ts

@@ -262,6 +262,9 @@ export class PeerTubeEmbed {
 
   private async buildDock (videoInfo: VideoDetails, configResponse: Response) {
     if (this.controls) {
+      // On webtorrent fallback, player may have been disposed
+      if (!this.player.player_) return
+
       const title = this.title ? videoInfo.name : undefined
 
       const config: ServerConfig = await configResponse.json()