MySQL unexpected AV in Delphi App

Using the Delphi Direct Access Components for MySQL (http://www.microolap.com)

Can anybody explain why the following (Delphi) code snippet causes an Access Violation when I try to close aQuery1 after I've closed aQuery2, but not if I close aQuery1 first? Better still, can anybody tell me how to stop this from happening (ie how to have two nested queries and close the innermost one first).

procedure TfrmNexusTest.TntButton1Click(Sender: TObject);
var
  dbMySQL : TmySQLDatabase;
  aQuery1 : TMySQLQuery;
  aQuery2 : TMySQLQuery;
begin
  aQuery1 := nil;
  aQuery2 := nil;
  dbMySQL := TmySQLDatabase.Create(nil);
  try
    dbMySQL.Host := 'localhost';
    dbMySQL.UserName := 'root';
    dbMySQL.UserPassword := 'mypassword';
    dbMySQL.DatabaseName := 'mydatabase';
    dbMySQL.Open;

    aQuery1 := TMySQLQuery.Create(nil);
    aQuery1.Database := dbMySQL;
    aQuery2 := TMySQLQuery.Create(nil);
    aQuery2.Database := dbMySQL;

    aQuery1.SQL.Text := 'Select * from table1';
    aQuery1.Open;
    // aQuery1.Close; // If I call aQuery1.Close here then everything is OK

    aQuery2.SQL.Text := 'Select * from table2';
    aQuery2.Open;
    aQuery2.Close;

    aQuery1.Close; // If I call aQuery1.Close here then I get an AccessViolation
  finally
    FreeAndNil(aQuery2);
    FreeAndNil(aQuery1);
    dbMySQL.Close;
    FreeAndNil(dbMySQL);
  end;
end;


Alternatively, are there any better Delphi MySQL components out there that would solve the problem?