Evolver-Apex-display-causing-ArgumentOutOfRangeException

WL Team - the Apex feature of evolver truly is outstanding. Thank you for the excellent initiative

Here is a minor bug surfacing from time to time whilst running Evolver and watching the Apex tab. Evolver does not crash and continues in the background; clicking OK (can be several times) clears the error window. The Exception window does not appear when in Evolver tab.