Expected an integer or an iterable of integers. Got None instead.

What is your issue?

I have the following xarray dataset

<xarray.Dataset> Size: 225kB
Dimensions:    (time: 1, lat: 78, lon: 143)
Coordinates:
    satellite  <U6 24B 'NOAA20'
  * time       (time) datetime64[ns] 8B 2025-01-24T01:17:04
  * lat        (lat) float64 624B 48.52 48.52 48.53 48.53 ... 48.89 48.9 48.9
  * lon        (lon) float64 1kB 4.142 4.147 4.152 4.157 ... 4.842 4.847 4.852
Data variables:
    values_i1  (time, lat, lon) float32 45kB -999.0 -999.0 ... -6.548e+07 -999.0
    values_i2  (time, lat, lon) float32 45kB -999.0 -999.0 ... -6.548e+07 -999.0
    values_i3  (time, lat, lon) float32 45kB -999.0 -999.0 ... -6.548e+07 -999.0
    values_i4  (time, lat, lon) float32 45kB -999.0 -999.0 ... 261.5 -999.0
    values_i5  (time, lat, lon) float32 45kB -999.0 -999.0 ... 254.4 -999.0
Attributes:
    regrid_method:  bilinear

I would like to save it as a zarr file.
Unfortunately when I try dr_out.load().to_zarr("regridded.zarr", mode="w") I get TypeError: Expected an integer or an iterable of integers. Got None instead.

Start by reproducing the reported dr_out.load().to_zarr("regridded.zarr", mode="w") call from the issue. Trace the to_zarr entry point and the resulting TypeError, then verify that the same dataset can be written successfully and add coverage for this reported case if the project’s existing tests provide a suitable location.