Error Stack Underflow and Access Violation Delphi 7

I am changing the database of my Delphi application from Firebird to PostgreSQL, however in some points of my application when I am accessing information from the Bank the following error message occurs:

ButIhavenoideawhatmightbecausingthiserrorifyouhavesomeidea

I'lladdtheerrorthatalsooccursabitbeforeaccessingthispartoftheapplication:

When I run the application through Delphi, the line that always acknowledges error is inside a DB.pas file in the access path C:\Program Files (x86)\Borland\Delphi7\Source\Vcl and the line is as follows:

procedure TDataSet.Open;
begin
Active := False; //Cursor do erro aponta aqui
end;