Как исправить ошибку Illegal string offset 'available' на PHP 5.4?

Warning: Illegal string offset 'aviable' in C:\OpenServer\domains\site.ru\engine\ajax\fileserver.php on line 93 Warning: Illegal string offset 'ttl' in C:\OpenServer\domains\site.ru\engine\ajax\fileserver.php on line 94 Warning: Illegal string offset 'aviable' in C:\OpenServer\domains\site.ru\engine\ajax\fileserver.php on line 93 Warning: Illegal string offset 'ttl' in 

$allow_group=array();
$min_ttl = $fsconfig['1']['ttl'];
foreach($fsconfig as $key => $value){
    if( $value['aviable'] ) $allow_group[]=$key;
    if( $min_ttl > $value['ttl'] ) $min_ttl = $value['ttl'];
}