Error javascript Uncaught TypeError: Cannot read property 'apply' of undefined

Hi,

I'm trying to execute code within callback ajax and I received this error javascript "Error javascript Uncaught TypeError: Cannot read property 'apply' of undefined",

The callback ajax contains the following code:

function eweev_edit_update_callback($form, &$form_state){

$data = drupal_json_encode(array( "selector_button_edit" => "ATRIBUTE1", "form" => "ATRIBUTE2");
$commands[] = ajax_command_invoke(NULL, "claim_edit_update", array($data));
return array(
'#type' => 'ajax',
'#commands' => $commands,
);
}

But when I added node_save() to the code the error javascript disappear and all things work properly:

function eweev_edit_update_callback($form, &$form_state){
$node = node_load(ID);
node_save(node);

$data = drupal_json_encode(array( "selector_button_edit" => "ATRIBUTE1", "form" => "ATRIBUTE2");
$commands[] = ajax_command_invoke(NULL, "claim_edit_update", array($data));
return array(
'#type' => 'ajax',
'#commands' => $commands,
);
}

Can anybody help me out with this?

Thanks!