Selecting the Schema in Faber on the "CredentialsSchema" screen generates error

[swcurran]

When I select the Schema in the drop down, the following error appears on the logs:

faber-controller_1  | fail: Microsoft.AspNetCore.Components.Server.Circuits.CircuitHost[111]
faber-controller_1  |       Unhandled exception in circuit 'vZkbr75ICYHFcMWpnASVzOnxGz9te7Vvwuxm7Ze1Zfk'.
faber-controller_1  | System.NullReferenceException: Object reference not set to an instance of an object.
faber-controller_1  |    at FaberController.Schema.Components.Schema.OnSelectSchema(ChangeEventArgs e) in /app/FaberController/Schema/Components/Schema.razor:line 46
faber-controller_1  |    at System.Threading.Tasks.Task.<>c.<ThrowAsync>b__139_0(Object state)
faber-controller_1  |    at Microsoft.AspNetCore.Components.Rendering.RendererSynchronizationContext.ExecuteSynchronously(TaskCompletionSource`1 completion, SendOrPostCallback d, Object state)
faber-controller_1  |    at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
faber-controller_1  | --- End of stack trace from previous location where exception was thrown ---
faber-controller_1  |    at Microsoft.AspNetCore.Components.Rendering.RendererSynchronizationContext.ExecuteBackground(WorkItem item)

And on the screen:

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