Forum Discussion
Nullable object must have a value.
That's a rather funny error message. If you have a Pro license you can open a Pro ticket at https://admin.powerplatform.microsoft.com/newsupportticket/powerbi
Otherwise you can raise an issue at https://community.fabric.microsoft.com/t5/Issues/idb-p/Issues .This solved my issue:
While connecting to the Oracle database, a few options are checked in by default. By un-checking the option: "Include relationship columns". The issue is solved.
P.S. This post explains that there is a performance improvement when we un-select the "include relationship columns".
Overhead of getting relationship columns in Power BI DirectQuery mode (crossjoin.co.uk)
That's a rather funny error message. If you have a Pro license you can open a Pro ticket at https://admin.powerplatform.microsoft.com/newsupportticket/powerbi
Otherwise you can raise an issue at https://community.fabric.microsoft.com/t5/Issues/idb-p/Issues .