[Cakephp 2.8.1] Multiple assosication to one model with habtm throws a notice

Hello Cakephp Fans,

today i receive these error:

Notice (8): Undefined index: User [CORE\Cake\Model\Datasource\DboSource.php, line 1388]
Its easy to reproduce:

Model: User belongsTo Group
Model: Permission habtm Rights (className User)
       Permission habtm Owners (className User)

When i use now 
$this->Permission->find('all', array('recursive' => -2)); 
the notice will be thrown. But only for the 2nd habtm.

The output is like:
array(
        'Permission' => array(
                'id' => '6',
        ),
        'Owner' => array(
                (int) 0 => array(
                        'id' => '499',
                        'PermissionOwner' => array(
                                'id' => '6',
                                'user_id' => '499',
                                'permission_id' => '6'
                        )
                )
        ),
        'Rights' => array(
                (int) 0 => array(
                        'id' => '485',
                        'PermissionRight' => array(
                                'id' => '18',
                                'permission_id' => '6',
                                'user_id' => '485',
                        ),
                        'Group' => array()
                ),
                (int) 1 => array(
                        'id' => '124',
'PermissionRight'                                'id' => '19',
                                'permission_id' => '6',
                                'user_id' => '124',
                        ),
                        'Group' => array()
                )
        )
)


Kind Regards

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