refBuilder: Cannot read property 'key' of undefined

[nicoonee]

I have an issue when use refBuilder and do try catch inside function PathMonitor(esc, path) {)
i got TypeError: Cannot read property 'key' of undefined.

My config code:
refBuilder: function(ref, path) {
return ref.ref.orderByChild('updatedAt').startAt(Date.now());
}

and data structure is

items: {
$id: {
createdAt:
id:
name:
updatedAt:
}

[kleeb]

#163