A valid React element (or null) must be returned.

[gregnb]

A valid React element (or null) must be returned.

[gregnb]

So I played around with this a bit tonight and I am able to replicate your error. A quick fix around this is to upgrade to react and react-dom 16 and above. Is that something you can change in your current project?

I'll still look into what causes issues for 15.6 but will need time

[jaydreyer]

OK. Bummer. We'll look into migrating to react 16 or I'll keep looking for a datagrid controller. Yours is good! Thanks for investigating.

[gregnb]

Would you mind putting up a sandbox? For example:
https://codesandbox.io/s/wy2rl1nyzl

[jaydreyer]

That's going to be tough to do because it's part of a larger app. I can paste the page code in there if it would help. Basically, when I have

            <MUIDataTable
              title={'API Catalog'}
              data={tableData}
              columns={tableColumns}
              options={tableOptions}
            />

in the code, I get the error. If I comment it out, things work fine (other than I have no data table).

[jaydreyer]

What I really don't get is the rest of the table component seems to show up. You can see the title, and if you click the download icon, it will download a csv with the dummy data I used. It also says '1-2 of 2', which is correct, as well.

[jaydreyer]

Last thing I can think of, we are using material-ui 1.0.0-beta.27. I don't know if that would cause an issue.

[gregnb]

Could you paste the data you use to populate the table ? Feel free to remove any sensitive data

[jaydreyer]

const tableColumns = ['API', 'Lifecycle Status', 'API Type', 'Owner']

const tableData = [['loading', 'loading', 'loading', 'loading'], ['loading', 'loading', 'loading', 'loading']]

[gregnb]

Ok great, thanks! I'll look into this tonight

[jaydreyer]

Thanks for checking. I'm not sure about being able to upgrade. I'll have to investigate and see if that causes any other issues for us. Thanks!

[gregnb]

I tried working this out some more but it will not go. As a result I set the peerDependencies to be minimum 16 and above for React. Just does not work well otherwise. Sorry for the inconvenience