SQL : 'System.Guid' failed because the materialized value is null. Either the result type's generic

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SQL : 'System.Guid' failed because the materialized value is null. Either the result type's generic parameter or the query must use a nullable type
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SQL : 'System.Guid' failed because the materialized value is null. Either the result type's generic parameter or the query must use a nullable type
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the the result nullable 'System.Guid' because type value a query Either materialized SQL null. : or type's failed use is the must parameter generic



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