Get Data - SharePoint online image library - stopped working - PeopleInMediaId error

[tp_bi]

This was working on 25/07/2015, but now I get an error.

DataSource.Error: We couldn't parse OData response result. Error: A null value was found for the property named 'PeopleInMediaId', which has the expected type 'Collection(Edm.Int32)[Nullable=False]'. The expected type 'Collection(Edm.Int32)[Nullable=False]' does not allow null values.
Details:
DataSourceKind=SharePoint
DataSourcePath=https://[my_company].sharepoint.com/sites/[my_site]/_api/Web/Lists(guid'[the_guid]')/Items

For a similar error, someone suggested changing the ApiVersion = 15 to 14 in the Advanced Editor but that doesn't fix it. 

I've tested with a fresh image library with just one picture that I Shared to try to bypass the error, but it still fails.

Any ideas?

Thanks.