Traceback (most recent call last):


 "/home/vsts/work/1/s/tests/fork_test.py", line 117, in test_on_start

context = self.router.fork(on_start=on_start)


 "/home/vsts/work/1/s/mitogen/parent.py", line 2482, in fork

return self.connect(u'fork', **kwargs)


 "/home/vsts/work/1/s/mitogen/parent.py", line 2448, in connect

return self._connect(klass, **mitogen.core.Kwargs(kwargs))


 "/home/vsts/work/1/s/mitogen/parent.py", line 2428, in _connect

conn.connect(context=context)


 "/home/vsts/work/1/s/mitogen/parent.py", line 1710, in connect

raise self.exception
mitogen.parent.EofError: EOF on stream; last 100 lines received:

Traceback (most recent call last):


 "<stdin>", line 1, in <module>


 "C:\Program 
s\Python36\lib\site-packages\dask\dataframe\core.py", line 1004, in repartition

return repartition(self, divisions, force=force)


 "C:\Program 
s\Python36\lib\site-packages\dask\dataframe\core.py", line 4486, in repartition

df._name, tmp, out, force=force)


 "C:\Program 
s\Python36\lib\site-packages\dask\dataframe\core.py", line 4257, in repartition_divisions

if a[0] < b[0]:
TypeError: '<' not supported between instances of 'NoneType' and 'int'
