how to force an insert before Raise Exception?

Hi.

I made a function that Raise exception with some conditions.
No problem with that, it is the goal.

My problem is that i want to do an INSERT into a log table before to raise
the exception. But RAISE EXCEPTION cancels my Insert.

How to force the insert to not being cancelled please?
Note that i want my exception to be raised , so i can't use:
EXCEPTION WHEN THEN

Thanks for your help.

example :
CREATE OR REPLACE FUNCTION "PrepareTrialLic"(userid integer)
BEGIN;
IF userid = 0 THEN
--I want to force that insert !!!!!!!!!!!!!!!!!!
INSERT INTO log_error(caller, description) VALUES('PrepareTrialLic',
'userid is 0');
RAISE EXCEPTION 'userid can''t be equal to 0';
ENDIF;
END;

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