Fatal Error after upgrade to 2.5.6 - Joomla! Forum - community, help and support

i receiving fatal error (memory exhausted) on custom component after upgrading version 2.5.3 2.5.6. have isolated te problem in opinion quite particular , seems problem 'where clause'.

below find code problem located (in model):

code: select all

      $db      = $this->getdbo();
      $query   = $db->getquery(true);
      $query->select('a.*');
      $query->from('#__foo a');
      $query->where('a.id = '.$foo_id );


      $db->setquery((string)$query);
      if (!$db->query()) {
         jerror::raiseerror(500, $db->geterrormsg());
      }

      $this->_item = $db->loadassoc();

      return $this->_item;

it simple piece of code retrieve right information database table view. strange thing when remove clause, code seems work fine (except producing right result obviously).
when replace clause clause true,

code: select all

$query->where('1=1');

, code produces fatal error. same happens when hardcode query string.

any ideas?

have tried run sql query in phpmyadmin?

enable debug on site , see sql queries generated.