Traceback (most recent call last):


 "app.py", line 11, in <module>

t.insert({'xuid': uuid.uuid4().hex, 'name': ''})


 "/usr/local/lib/python3.8/site-packages/dataset/table.py", line 103, in insert

row = self._sync_columns(row, ensure, types=types)


 "/usr/local/lib/python3.8/site-packages/dataset/table.py", line 376, in _sync_columns

name = self._get_column_name(name)


 "/usr/local/lib/python3.8/site-packages/dataset/table.py", line 83, in _get_column_name

return self._column_keys.get(key, name)


 "/usr/local/lib/python3.8/site-packages/dataset/table.py", line 64, in _column_keys

if key in self._columns:
TypeError: argument of type 'NoneType' is not iterable

Traceback (most recent call last):


 "C:\Users\rossmar\Documents\github\dask\issues\empty-partitions.py", line 6, in <module>

ddf[ddf.x > 4].x.cumsum().compute()


 "C:\miniforge\lib\site-packages\dask\base.py", line 281, in compute

(result,) = compute(self, traverse=False, **kwargs)


 "C:\miniforge\lib\site-packages\dask\base.py", line 563, in compute

results = schedule(dsk, keys, **kwargs)


 "C:\miniforge\lib\site-packages\dask\threaded.py", line 76, in get

results = get_async(


 "C:\miniforge\lib\site-packages\dask\local.py", line 487, in get_async

raise_exception(exc, tb)


 "C:\miniforge\lib\site-packages\dask\local.py", line 317, in reraise

raise exc


 "C:\miniforge\lib\site-packages\dask\local.py", line 222, in execute_task

result = _execute_task(task, data)


 "C:\miniforge\lib\site-packages\dask\core.py", line 121, in _execute_task

return func(*(_execute_task(a, cache) for a in args))


 "C:\miniforge\lib\site-packages\pandas\core\ops\common.py", line 65, in new_method

return method(self, other)


 "C:\miniforge\lib\site-packages\pandas\core\arraylike.py", line 89, in __add__

return self._arith_method(other, operator.add)


 "C:\miniforge\lib\site-packages\pandas\core\series.py", line 4995, in _arith_method

result = ops.arithmetic_op(lvalues, rvalues, op)


 "C:\miniforge\lib\site-packages\pandas\core\ops\array_ops.py", line 189, in arithmetic_op

res_values = _na_arithmetic_op(lvalues, rvalues, op)


 "C:\miniforge\lib\site-packages\pandas\core\ops\array_ops.py", line 149, in _na_arithmetic_op

result = _masked_arith_op(left, right, op)


 "C:\miniforge\lib\site-packages\pandas\core\ops\array_ops.py", line 111, in _masked_arith_op

result[mask] = op(xrav[mask], y)
TypeError: unsupported operand type(s) for +: 'int' and 'NoneType'
