Traceback (most recent call last):


 "C:\Users\S10500\AppData\Local\Continuum\anaconda3\lib\site-packages\spyder\widgets\ipythonconsole\client.py", line 575, in show_time

elapsed_time = time.monotonic() - self.t0
TypeError: unsupported operand type(s) for -: 'float' and 'NoneType'

Traceback (most recent call last):


 "/home/nfern/.virtualenvs/back_00/lib/python3.7/site-packages/drf_yasg/utils.py", line 407, in get_field_default

default = field.to_representation(default)


 "/home/nfern/.virtualenvs/back_00/lib/python3.7/site-packages/rest_framework/fields.py", line 944, in to_representation

return int(value)
TypeError: int() argument must be a string, a bytes-like object or a number, not 'NoneType'
