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Problem to display a multi file dataset in a Jupyter notebook. AttributeError: 'NoneType' object has no attribute 'render' #10384

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@jotape-e

Description

@jotape-e

What happened?

I'm getting the error while trying to display a dataset opened through xarray.open_mfdataset() with a defined chunk in a jupyter notebook.

I can reproduce the error using this sample file from Unidata using the following packages (version).

  • dask 2025.5.1
  • h5netcdf 1.6.1
  • h5py 3.13.0
  • ipykernel 6.29.5
  • ipython 9.3.0
  • ipython_pygments_lexers 1.1.1
  • jedi 0.19.2
  • jupyter_client 8.6.3
  • jupyter_core 5.8.1
  • netCDF4 1.7.2
  • scipy 1.15.3
  • xarray 2025.4.0

I'm using other basic packages but i think these are the main packages to help in bug tracking.
The error that is displayed is the following:

Image

What did you expect to happen?

Display the dataset with the 'chunk scheme'.

Minimal Complete Verifiable Example

import xarray as xr

from glob import glob

arqs = list(glob('../sre*'))
ds = xr.open_mfdataset([arqs[0]], engine='scipy', chunks={'lat':50, 'lon':50}

MVCE confirmation

  • Minimal example — the example is as focused as reasonably possible to demonstrate the underlying issue in xarray.
  • Complete example — the example is self-contained, including all data and the text of any traceback.
  • Verifiable example — the example copy & pastes into an IPython prompt or Binder notebook, returning the result.
  • New issue — a search of GitHub Issues suggests this is not a duplicate.
  • Recent environment — the issue occurs with the latest version of xarray and its dependencies.

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