I found in my error log this

[12-Nov-2011 19:22:26] PHP Warning:  Attempt to assign property of non-object in  on line 1768776801
[12-Nov-2011 19:22:31] PHP Warning:  Attempt to assign property of non-object in  on line 1768776801
[12-Nov-2011 19:22:39] PHP Warning:  Attempt to assign property of non-object in  on line 1768776801
[12-Nov-2011 19:22:40] PHP Warning:  Attempt to assign property of non-object in  on line 1768776801
[12-Nov-2011 19:22:46] PHP Warning:  Attempt to assign property of non-object in  on line 1768776801
[12-Nov-2011 19:22:51] PHP Warning:  Attempt to assign property of non-object in  on line 1768776801

Of course I don't have any script with 1 bn lines.

PHP Version 5.3.3-7
Apache 2

The other weird thing is that I have a

set_error_handler( 'myHandler' );

To write in the error log other inforamtion too, but with this error it seems PHP just ignores my error_handler =/ I don't have any code that can generate this errore before my call to set_error_handler