After Studio crash: Error while generating Report for Translation Quality Assessment: Value cannot be null. Parameter name: key.

Hi all,

Note: this happened after Studio crash:

I've been working on a file with "Assess Quality" activated.
It's a 10000 words file and it seemed that this was a lot for Studio because all Tasks (especially Confirm segment) took a long time (about 15-20 seconds).

Then Studio crashed (as Studio often does :-)
But I could finish the review.

When I wanted to generate the report for Translation Quality Assessment, I got this error:

Unexpected exception when completing task 'Translation Quality Assessment': Value cannot be null. Parameter name: key.

My client is now waiting for the return Package and the report.

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<SDLErrorDetails time="12.09.2021 09:28:22">
<ErrorMessage>Unexpected exception when completing task 'Translation Quality Assessment': Value cannot be null.
Parameter name: key.</ErrorMessage>
<Exception>
<Type>Sdl.ProjectApi.ProjectApiException, Sdl.ProjectApi, Version=16.0.0.0, Culture=neutral, PublicKeyToken=c28cdb26c445c888</Type>
<HelpLink />
<Source>Sdl.ProjectApi.Implementation</Source>
<HResult>-2146233088</HResult>
<StackTrace><![CDATA[ at Sdl.ProjectApi.Implementation.TaskExecution.ContentProcessingTaskImplementation.TaskComplete()
at Sdl.ProjectApi.Implementation.AutomaticTaskExecuter.Execute()]]></StackTrace>
<InnerException>
<Type>System.ArgumentNullException, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</Type>
<ParamName>key</ParamName>
<HelpLink />
<Source>mscorlib</Source>
<HResult>-2147467261</HResult>
<StackTrace><![CDATA[ at System.Collections.Generic.Dictionary`2.FindEntry(TKey key)
at Sdl.ProjectApi.AutomaticTasks.Feedback.FeedbackTask.CreateSegmentFeedbackGroupElementAttributes(SegmentFeedbackGroupSection segmentFeedbackGroupSection)
at Sdl.ProjectApi.AutomaticTasks.Feedback.FeedbackTask.CreateSegmentFeedbackGroupElement(SegmentFeedbackGroup segmentFeedbackGroup)
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

Any idea what it could be?
Thanks in advance

J.R