ISM1 decoder at 48kbps hits assert in minimum_statistics()

Using the left channel of item 34 from the SQAM stereo items resampled to 32kHz and

IVAS_cod_flt -ism 1 NULL -dtx -max_band swb 48000 32 34_32.wav bit
IVAS_dec_fx EXT 32 bit out.wav

results in

Assertion failed: (f >= 0), function minimumStatistics, file er_util_fx.c, line 130.

This happens in frame 320.