fluidsynth.stop_everything() writes 16 'CRITICAL' error messages to stderr

[reticulatus]

When I call fluidsynth.stop_everything() the following 'CRITICAL' error message is written 16 times to stderr:

** (MusicSequencerApplication.py:6546): CRITICAL **: 21:39:22.946: fluid_synth_noteoff: assertion 'key >= 0 && key <= 127' failed

If I reduce the range in line 180 of sequencer.py from 118 to 116:

for x in range(116):

then the error messages do not appear.

Is this a bug or expected behaviour?