<b>Notice</b>: Trying to get property 'id' of non-object in <b>C:

When i tried to update or delete it give this notice

<b>Notice</b>: Trying to get property 'id' of non-object in <b>C:UsersHusam Al-MasriPhpstormProjectsTODOapitasksupdate.php</b> on line <b>24</b><br /><br />
<b>Notice</b>: Trying to get property 'taskName' of non-object in
<b>C:UsersHusam Al-MasriPhpstormProjectsTODOapitasksupdate.php</b> on line <b>25</b><br /> <br />
<b>Notice</b>: Trying to get property 'taskDescription' of non-object in <b>C:UsersHusam Al-MasriPhpstormProjectsTODOapitasksupdate.php</b> on line <b>26</b><br />
{"message": "task was updated."}


in get and create the code worked, whats the wrong in my update code?
I search in stackoverflow with the same title but i see every body has a case different of my case so please no body say the question is duplicated.
And after the notice it echo {"message": "Task was deleted."}

<?php
// required headers
header("Access-Control-Allow-Origin: *");
header("Content-Type: application/json; charset=UTF-8");
header("Access-Control-Allow-Methods: PUT");
header("Access-Control-Max-Age: 3600");
header("Access-Control-Allow-Headers: Content-Type, Access-Control-Allow-Headers, Authorization, X-Requested-With");

// get database connection
include_once '../../config/Database.php';

// instantiate models object
include_once '../../models/Tasks.php';

$database = new Database();
$db = $database->getConnection();

$tasks = new Tasks($db);

// get tasks data
$data = json_decode(file_get_contents("php://input"));
// set tasks property values
$tasks->id = $data->id;
$tasks->taskName = $data->taskName;
$tasks->taskDescription = $data->taskDescription;
// create the task
if($tasks->update()){
echo '{';
echo '"message": "task was updated."';
echo '}';
}

// if unable to update the task.
else{
echo '{';
echo '"message": "Unable to update task."';
echo '}';
}
?>


And this is function for update

function update(){
// query to insert record
$query = "UPDATE
" . $this->table_name . "
SET
taskName=:taskName,
taskDescription=:taskDescription
where
id=:id";

// prepare query
$stmt = $this->conn->prepare($query);

// sanitize
$this->taskName=htmlspecialchars(strip_tags($this->taskName));
$this->taskDescription=htmlspecialchars(strip_tags($this->taskDescription));
$this->id=htmlspecialchars(strip_tags($this->id));

// bind values
$stmt->bindParam(":taskName", $this->taskName);
$stmt->bindParam(":taskDescription", $this->taskDescription);
$stmt->bindParam(":id", $this->id);
// execute query
if($stmt->execute()){
return true;
}

return false;

}


Edit
And in postman it give me Unexpected '<'

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