Clone method called on non-object error in my function

[kokoseq]

Hi,

I am getting "clone method called on non-object" error on line:

$to = clone $calendar->from_time; 

Does anyone know, how ti fix this? I need to solve this ASAP, thanks for any help.

Code of my function is:

public function renderDetail($id)
    {
        $db = $this->getService('database');
        $event = $db->table('events')->find($id)->fetch();
        $place = $db->table('places')->find($event->id_place)->fetch();

    if ($event->permanent)
    {
        $today = new NetteDateTime();
        $calendar = $db->table('calendar')->where(array(
            'event_id' => $event->id,
            'day_id' => $today->format('N'),
        ))->fetch();                        
    }
    else
    {
        $calendar = $db->table('calendar')->where(array(
            'event_id' => $event->id,
        ))->fetch();
    }
    $to = clone $calendar->from_time;
    $interval = new DateInterval('PT'.$calendar->duration->format('H').'H'.$calendar->duration->format('i').'M');
    $to->add($interval);

    $response = array(
        'place_name' => $place->name,
        'message' => $event->message,
        'from' => $calendar->from_time->format('H:i'),
        'to' => $to->format('H:i'),
        'latitude' => $place->latitude,
        'longitude' => $place->longitude,
        'address' => $place->address,
    );

    $this->sendResponse(new NetteApplicationResponsesJsonResponse(array(
        'success' => true,
        'event' => $response,
    )));
} 

Thank you!

[bradgrafelman]

First question that comes to mind is: What type is the value in $calendar->from_time since it isn't an object (hint: [man]var_dump/man will tell you)? Follow-up question would be: Why are you trying to treat that value as if it were an object even though it isn't one?