Telegram cannot play voice messages

I just opened the following:

…but i don’t know if it is an issue with the f-droid build or not, so i’m posting here too.
Playing voice messages do work in google play telegram, but not in the f-droid build; other sounds like mp3 does play instead.

as i tap the play button, logcat shows:
I/str_params( 306): key: ‘bgm_state’ value: ‘’
E/MediaPlayerService( 306): error: -2147483648
E/MediaPlayer( 6835): Unable to create media player

This happens on a stock zenfone ze551ml running lollipop 5.01

Any advice? Thanks…