Repeated search for same computer results in error

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Steps to reproduce:

1. search for some computer, that is present in Active Directory (for example - TEST1);
2. select computer, adding it to the list below search prompt;
3. Hit 'X' to delete computer from list below search prompt;
4. search again for TEST1;
5. try to add it again to the list;

Result - nothing happens on client - computer is not added to the list.
On server there is error in logs:

System.ArgumentException: An item with the same key has already been added. Key: TEST
   at System.Collections.Generic.Dictionary`2.TryInsert(TKey key, TValue value, InsertionBehavior behavior)
   at System.Collections.Generic.Dictionary`2.Add(TKey key, TValue value)
   at LAPS_WebUI.Pages.LAPS.OnSelectedItemChangedAsync(ADComputer value) in /src/Pages/LAPS.razor.cs:line 35

LAPS-WebUI version: 1.5.5, used from docker container