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Exception on entity fetch by key #432
Description
The exception was thrown at the production but could not be reproduced
System.InvalidOperationException: Collection was modified; enumeration operation may not execute.
at System.Collections.Generic.HashSet`1.Enumerator.MoveNext()
at Xtensive.Orm.Internals.Prefetch.Fetcher.UpdateCacheFromAllEntityGroupTasks()
at Xtensive.Orm.Internals.Prefetch.Fetcher.ExecuteTasks(IReadOnlyCollection`1 containers, Boolean skipPersist, Boolean isAsync, CancellationToken token)
at Xtensive.Orm.Internals.Prefetch.PrefetchManager.ExecuteTasks(Boolean skipPersist, Boolean isAsync, CancellationToken token)
at Xtensive.Orm.Providers.SqlSessionHandler.FetchEntityState(Key key)
at Xtensive.Orm.QueryEndpoint.SingleOrDefault(Key key)
at Xtensive.Orm.QueryEndpoint.SingleOrDefault[T](Key key)
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