Error with update and delete new created item

[zohon]

i have done test with https://noteplaces.firebaseio.com/

and i can edit and delete element if they are loaded form firebase but when i create a new one i cannot edit it or delete it unless i reload the page.

it work when i add it with :

var ref = new Firebase('https://noteplaces.firebaseio.com/');
ref.push({
label: "New place",
});

but not with :

this.push('places', {
label: "New place",
});

this is the first error i get when i try to edit after the creation :

Uncaught Error: Firebase.child failed: First argument was an invalid path: "undefined". Paths must be non-empty strings and can't contain ".", "#", "$", "[", or "]" firebase-debug.js:8749

and when i try again i got this one :

Uncaught Error: Firebase.child failed: First argument was an invalid path: "null". Paths must be non-empty strings and can't contain ".", "#", "$", "[", or "]" firebase-debug.js:8749

i think i lost the link with firebase for my item but i cannot see where is it an error from my firebase ?