mysqli_real_escape_string() expects parameter 2 to be string, array given in /database.mysqli.inc on line 323

what version of php and drupal are you using?

also have you checked other modules for the same error? Turn off boost to make sure it is causing the error.
#268891: mysqli_real_escape_string() expects parameter 2 to be string, array given in /includes/database.mysqli.inc on line 323
#642946: warning: mysqli_real_escape_string() expects parameter 2 to be string
#510020: warning: mysqli_real_escape_string() expects parameter 2 to be string
ect... http://www.google.com/search?q=site:drupal.org+%22mysqli_real_escape_str...

If Boost is causing the error how can the bug be reproduced?

#651798: mysql_real_escape_string() expects parameter 1 to be string because page_id is an array

My debugging efforts with the same error identified Freelinking 3.0-alpha3 as the villain. Maybe that's of some use to you.

Also I have this error that is verified in two sites of mine after having made the updating of the same forms; the forms in matter are: nodewords -6.x-1.5, views -6.x-2.8 and page_title -6.x-2.3. I am sure that one of the three forms are the person responsible of the error, but I have not understood yet which of the three.

Try this
http://drupal.org/project/trace

Good Luck

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I have not had the error anymore after having effected the updating of Nodewords from the version 6.x-1.5 to the version 6.x-1.8
http://giovanninews.com/