[Android] Crash fix when currentMediaPosition is -1

[Nicolas Pomepuy]

vlc-android | branch: master | Nicolas Pomepuy <nicolas at videolabs.io> | Wed Apr  1 07:44:55 2020 +0200| [51938c13b5c43b6539a3b5129095483846028583] | committer: Geoffrey Métais

Crash fix when currentMediaPosition is -1

> https://code.videolan.org/videolan/vlc-android/commit/51938c13b5c43b6539a3b5129095483846028583
---

 application/vlc-android/src/org/videolan/vlc/gui/audio/AudioPlayer.kt | 1 +
 1 file changed, 1 insertion(+)

diff --git a/application/vlc-android/src/org/videolan/vlc/gui/audio/AudioPlayer.kt b/application/vlc-android/src/org/videolan/vlc/gui/audio/AudioPlayer.kt
index 39e5711e8..dbd3cf976 100644
--- a/application/vlc-android/src/org/videolan/vlc/gui/audio/AudioPlayer.kt
+++ b/application/vlc-android/src/org/videolan/vlc/gui/audio/AudioPlayer.kt
@@ -311,6 +311,7 @@ class AudioPlayer : Fragment(), PlaylistAdapter.IPlayer, TextWatcher, IAudioPlay
         lifecycleScope.launchWhenStarted {
             val text = withContext(Dispatchers.Default) {
                 val medias = playlistModel.medias ?: return at withContext ""
+                if (playlistModel.currentMediaPosition == -1) return at withContext ""
                 val elapsedTracksTime = medias.asSequence()
                         .take(playlistModel.currentMediaPosition)
                         .map { it.length }