html_url,issue_url,id,node_id,user,created_at,updated_at,author_association,body,reactions,performed_via_github_app,issue https://github.com/pydata/xarray/issues/5240#issuecomment-830685713,https://api.github.com/repos/pydata/xarray/issues/5240,830685713,MDEyOklzc3VlQ29tbWVudDgzMDY4NTcxMw==,6875882,2021-05-01T19:55:01Z,2021-05-01T19:55:01Z,CONTRIBUTOR,Thanks @keewis! I was confusing dimension names and variable names. I would support raising or falling back to a reasonably sane default -- the reason I stumbled on this was having a None coord name was breaking the _repr_html in Jupyter and causing a much more confusing error message,"{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,873713013