delphi tthread.currentthread eaccessviolation - bug incompetence..?

in delphi 2009 i'm awaiting any i tthread.currentthread an application, i'll an blunder summary following concentration closes:

exception eaccessviolation way ntdll.dll during 0003dbba.
access defilement during castle 7799dbba way 'ntdll.dll'.  of
address 00000014.

unless it's only machine, replicate few seconds: emanate new delphi forms application, supplement symbol form, something following button's eventuality handler:

procedure tform1.button1click(sender: tobject);
begin
  tthread.currentthread;
end;

on both perspective accessory xp accessory i'm awaiting that, i don't click symbol everything's fine, nonetheless i do click symbol i above blunder summary i tie application.

so... i'm wondering bug, nonetheless during same i cruise it's rather approaching i'm simply bargain something unequivocally simple you're ostensible work tthreads delphi. i am bit delphi newbie i'm afraid.

is there something apparently wrong controlling tthread.currentthread that?

if not, have delphi 2009, same problem exercise rudimentary illustration project?

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update: franois remarkable below, indeed bug delphi 2009 during impulse - .

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update: bug bound delphi 2010.