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The Smartermail indexing service stopped with an error after running for a year. I've tried to manually start the service many times, sometime it stop within a few seconds, sometimes a little longer. It seems it can still process some mailboxes in queue. I am using v11.7.5091
08:14:39 Indexing service encountered a critical error and is stopping: System.ArgumentException: An item with the same key has already been added.
at System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add)