Access violation when opening form 2th time on Android in Delphi XE7

When I open my form for the first time I get no violation, but when I first select a TEdit field and then close the form and then recreate the form and open it I get the Violation.

Code for creating the form:

procedure TfrmNocoreDKS.actConfigExecute(Sender: TObject);
var
  confForm: TConfiguratie;
begin
  confForm := TConfiguratie.Create(nil);
  confForm.ShowModal(
    procedure(ModalResult: TModalResult)
    begin
      confForm.DisposeOf;
    end);
end;

Code for Closing the form:

procedure TConfiguratie.FormClose(Sender: TObject; var Action: TCloseAction);
begin
  Action := TCloseAction.caFree;
end;