Warning while populating table from fixtures

In file fixtures.php on line 146:

if (in_array('Tree', $model->actsAs)) {
   $model->Behaviors->detach('Tree');
}

so if model doesn't have actsAs property You will see warning

Warning: in_array(): Wrong datatype for second argument in G:\Wamp\www\portal\users\vendors\shells\fixtures.php on line 146

solution

if (isset($model->actsAs) && in_array('Tree', $model->actsAs)) {
   $model->Behaviors->detach('Tree');
}