Blank confirmation page

Sorry, I don't know if forum is moderated and my message is already stopped.
I'm talking about confirmation page.
Why, when username o password is asked, a blank page is returned?
Without popup o message to advise user that something is gone sent.
I saw that the recover happens, but no message user can read.
Thannks
Trusco

Did you read the FAQ articles about blank pages?

Ops, I just saw it, and many thanks.
I got:
"Notice: Undefined offset: 0 .... /comprofiler.class.php on line 4896
Notice: Trying to get property of non-object in...comprofiler.class.php on line 5002 etc. etc.
and I'm just studying if there's a similar problem to try to solve it.
But my curiosity is still live, about that site feature.
I got the same "error" (blank page) here requesting password, so I was thinking it's not a problem solved.
Trusco

Just another question... if I post my sql error, do I have possibilities to solve my problem? I've searched out to several messages, but it seems no one got my problem. Now I know my problem, but I don't have solution.
Trusco

Well if you don;t post no one can help you...

The error is:
Notice: Undefined offset: 0 in .../administrator/components/com_comprofiler/comprofiler.class.php on line 4896

Notice: Trying to get property of non-object in .../administrator/components/com_comprofiler/comprofiler.class.php on line 5002
and other lines like that on line 5005, 5019... ... ...

thanks