[PHP] Problem z PHP - Undefined offset 0 i JSON Opcje

[---Gregor---]

Plik JSON:
[‹"embed_count":"3204","name":"username","s_count":"5900","category":"gaming","format":"live","_count":9538›]

Dostaję w PHP:
Array ( [0] => Array ( [embed_count] => 3216 [name] => username [s_count] => 5900 [category] => gaming [format] => live [_count] => 9538 )

Kod:
$json_file = @file_get_contents("...", 0, null, null);
$json_array = json_decode($json_file, true);
$this->guests= $json_array[0]['_count'];

I uwagach mam:
Undefined offset: 0 in ...

Ktoś mi może to wytłumaczyć?