$.ajax({
type: "POST",
dataType: "json", // этот параметр добавил и проблему исправило...
url :"ajax/upload_message.php",
data : { action : true, talking_with : "<? echo $_GET['talking_with']; ?>" },
success : function(datas)
{
$(".media-list-conversation").html(datas);
}
});
SELECT subscribers.id_request_reciver, wall_messages.* FROM subscribers JOIN wall_messages ON subscribers.id_request_reciver = wall_messages.id WHERE subscribers.id_request_sender = $loggedUser->id ORDER BY wall_messages.id_mes DESC