By asa-1 on

This error message apears intermitently at the top of any given page on my drupal website.

Notice: unserialize() [function.unserialize]: Error at offset 0 of 4 bytes in
/home/[my web site's root dir]/includes/common.inc on line 204

It does not allways appear, and it does not seem to affect the site (apart from a minor enlargement of font size). I have tried turning off various contrib modules, but to no avail. Any idea what is causing this?

http://www.peterstoneaction.org.uk/