Doing some editing of Places, I got an error.
From the tab Places, I selected a Place that had a cemetery name in the Place. There were 10 instances of it showing in the side panel.
Picked the first one and in the Edit window, I copied the cemetery name, deleted it leaving just the city, county, state. I pasted the cemetery name into the Place Details.
Moving on to the next instance, I deleted the entire Place, started entering the city that populated the rest then added the Details.
Repeated this about 5 times and got the error. Unfortunately I did not get a screenshot.
Closed database & reopened.
Subsequent efforts to get an error failed. It works fine now.