Issue: bad track: 'fLaC'

[GL1TCH3D]

Info: parsing healthy moov atom ...
Composition time offset atom found. Out of order samples possible.
ftyp_ = 'isom'
found avcC after: 102
remaining len:105
parsing avcC ...
len_sps: 39
decoding SPS ...
log2_max_frame_num: 6
avcC got decoded
assuming constant duration of 256 for 'avc1' (x4946)
ss: avc1 is_stable: 0
ss: using f=7 span
assuming constant duration of 4608 for 'fLaC' (x859)
ss: fLaC is_stable: 0
ss: using f=7 span

created dummy track 'free'
removed dummy track 'free'
first_failed: 0 of 101
simpleOrder: 0 1
order ( 101): (0, 3) (1, 1) (0, 5) (1, 1) (0, 6) (1, 1) (0, 6) (1, 1) (0, 6) (1, 1) (0, 5) (1, 1) (0, 6) (1, 1) (0, 6) (1, 1) (0, 6) (1, 1) (0, 5) (1, 1) (0, 6) (1, 1) (0, 6) (1, 1) (0, 6) (1, 1) (0, 5) (1, 1) (0, 6) (1, 1) (0, 6) (1, 1) (0, 6) (1, 1) (0, 5) (1, 1) (0, 6) (1, 1) (0, 6) (1, 1) (0, 6) (1, 1) (0, 5) (1, 1) (0, 6) (1, 1) (0, 6) (1, 1) (0, 6) (1, 1) (0, 6) (1, 1) (0, 5) (1, 1) (0, 6) (1, 1) (0, 6) (1, 1) (0, 6) (1, 1) (0, 5) (1, 1) (0, 6) (1, 1) (0, 6) (1, 1) (0, 6) (1, 1) (0, 5) (1, 1) (0, 6) (1, 1) (0, 6) (1, 1) (0, 6) (1, 1) (0, 5) (1, 1) (0, 6) (1, 1) (0, 6) (1, 1) (0, 6) (1, 1) (0, 5) (1, 1) (0, 6) (1, 1) (0, 6) (1, 1) (0, 6) (1, 1) (0, 5) (1, 1) (0, 6) (1, 1) (0, 6) (1, 1) (0, 6) (1, 1) (0, 6)
isTrackOrderEnough: 0 (sz=0)
genPatternPerm of: avc1
0 avc1 -1 0
1 fLaC 1.58496 3
genPatternPerm of: fLaC
0 avc1 2.52193 10
1 fLaC -1 0
has_zero_transitions_: 0
Error: bad track: 'fLaC'
bad track: 'fLaC'

I'm wondering if this is a function of the audio track given that I was recording in lossless audio?
Either way, thanks in advance!