"Nill error" for m3u8 playlist

[bt4ibwem8]

When there is many items (tv channels in .m3u8 format) inside m3u8 file and i switch to the next items from playlist, sooner or later mpv osc freezes (video is still playling, but osc elements are gone) with nill error.
This could be fixed by replacing ("media-title") with ("media-title", "") on the lines 1594 and 1596.