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On the "new" PHP 5.4 drupal generate this errors:
Warning: Illegal string offset 'field' in DatabaseCondition->__clone() (line 1903 of /home/site/public_html/includes/database/query.inc).
Notice: Undefined variable: key in DatabaseCondition->compile() (line 1817 of /home/site/public_html/includes/database/query.inc).
Since php 5.4 is out and some people start to using it this is a critical issue.