Renaming a locker field results in "An item with the same key has already been added" UI error

I renamed a locker field "HRISEmailAddress" to "EmailAddress" in the UNIFYBroker UI, and this stack dump error appeared:

System.Exception: Swagger Exception could not be parsed. SE response code: 500; SE response text: {"Message":"An error has occurred.","ExceptionMessage":"'The field EmailAddress could not be added to the schema","ExceptionType":"Unify.Framework.Schema.SchemaException","StackTrace":" at Unify.Framework.Schema.Schema`6.Add(TKey key, TFieldDef value)\r\n at Unify.Framework.Visitor.Visit[T](IEnumerable`1 visitCollection, Action`2 visitor)\r\n at Unify.Product.IdentityBroker.EntitySchemaFactory.CreateComponent(IEntitySchemaConfiguration factoryInformation)\r\n at Unify.Product.Plus.LockerEngine.GenerateLockerPair(ILockerInformation lockerConfiguration)\r\n at Unify.Product.Plus.LockerEngine.LockerConfigurationChanged(Guid lockerId, Action`1 lockerAction)\r\n at Unify.Product.Plus.LockerEngine.<>c__DisplayClass33_0.<UpdateLockerSchemaRow>b__0()\r\n at Unify.Product.Plus.LockerEngine.<>c__DisplayClass49_0.<ConfigurationChanged>b__0()\r\n at Unify.Framework.ExtensionMethods.WaitOnMutex(Mutex mutex, Action work)\r\n at Unify.Product.Plus.LockerEngineAuditingDecorator.UpdateLockerSchemaRow(Guid lockerId, IEntitySchemaFieldDefinitionConfiguration entitySchemaRowConfiguration)\r\n at Unify.Product.Plus.LockerEngineNotifierDecorator.<>c__DisplayClass25_0.<UpdateLockerSchemaRow>b__0()\r\n at Unify.Framework.Notification.NotifierDecoratorBase.Notify(ITaskNotificationFactory notificationFactory, Action action)\r\n at lambda_method(Closure , Object , Object[] )\r\n at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ActionExecutor.<>c__DisplayClassc.<GetExecutor>b__6(Object instance, Object[] methodParameters)\r\n at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ExecuteAsync(HttpControllerContext controllerContext, IDictionary`2 arguments, CancellationToken cancellationToken)\r\n--- End of stack trace from previous location where exception was thrown ---\r\n at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n at System.Web.Http.Controllers.ApiControllerActionInvoker.<InvokeActionAsyncCore>d__0.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n at System.Web.Http.Controllers.ActionFilterResult.<ExecuteAsync>d__2.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n at System.Web.Http.Filters.AuthorizationFilterAttribute.<ExecuteAuthorizationFilterAsyncCore>d__2.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n at System.Web.Http.Filters.AuthorizationFilterAttribute.<ExecuteAuthorizationFilterAsyncCore>d__2.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n at System.Web.Http.Dispatcher.HttpControllerDispatcher.<SendAsync>d__1.MoveNext()","InnerException":{"Message":"An error has occurred.","ExceptionMessage":"An item with the same key has already been added.","ExceptionType":"System.ArgumentException","StackTrace":" at System.ThrowHelper.ThrowArgumentException(ExceptionResource resource)\r\n at System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add)\r\n at Unify.Framework.Schema.Schema`6.Add(TKey key, TFieldDef value)"}}; ---> Unify.Framework.Client.SwaggerException: The HTTP status code of the response was not expected (500).

When I tried to get back to the main locker UI page to select the affected locker and fix my mistake the following error now appears every time:

System.ArgumentException: An item with the same key has already been added.

Could you please review the config and fix it so the locker screen works again?