drupal - PHP unserialize(): Error at offset -

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i have problem drupal 6.20.

possibly after php update, site stopped working. get:

notice: unserialize() [function.unserialize]: error @ offset 0 of 22765 bytes in /path/includes/cache.inc on line 33

this line:

$cache->data = unserialize($cache->data);

i appreciate help.

this problem happen when have drupal 6.x running on postgresql 9.0 because bytea type modified.
there suggested solutions here: http://postgresql.1045698.n5.nabble.com/bytea-error-in-postgresql-9-0-td3304087.html

running on database should fix it:

alter database databasename set bytea_output='escape';

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