Processing Error! return NaN.......

[luyan66]

if (err_info->Nutterances < 1)
{
/printf ("Processing error!\n");/
/exit (1);/
PyErr_SetString(PyExc_RuntimeError, "processing error!");
}
Log print warnings.warn('Processing Error! return NaN........')
use older version, i see it stop at conditions err_info->Nutterances < 1 processing error! WHY?
but if i change metric="pesq" to metric="" ，training is ok!