Configure time observer on the main queue

ios/App/Shared/player/AudioPlayer.swift

@@ -137,7 +137,9 @@ class AudioPlayer: NSObject {
     }
     
     private func setupTimeObserver() {
-        removeTimeObserver()
+        // Time observer should be configured on the main queue
+        DispatchQueue.main.sync {
+            self.removeTimeObserver()
             
             let timeScale = CMTimeScale(NSEC_PER_SEC)
             // Rate will be different depending on playback speed, aim for 2 observations/sec
@@ -155,6 +157,7 @@ class AudioPlayer: NSObject {
                 }
             }
         }
+    }
     
     private func removeTimeObserver() {
         if let timeObserverToken = timeObserverToken {