Yo encontré esto en el Help de Delphi:
Cita:
Creates and initializes an instance TSQLConnection.
constructor Create(AOwner: TComponent); override;
Description
Use Create to instantiate TSQLConnection at runtime. SQL connections added to forms or data modules at design time are created automatically.
The AOwner parameter is the component, typically a form or data module, that is responsible for freeing the SQL connection.
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No se si tendrá algo que ver, pero quizás no acepte nil como parámetro.