Annotation Google Chart error

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Who knows, what's going wrong with Google Annotation Charts? It doesn't work right now. I get

Uncaught TypeError: Cannot read property 'prototype' of null

In my console. This error in google library, not in my code.


I think Google is updating the Annotation Chart API

Testcode: https://jsfiddle.net/lecaoquochung/dsmgL9wj/15/

or Google Document page https://developers.google.com/chart/interactive/docs/gallery/annotationchart

P.S. I met the same error today (20160229) with the testcode above (It's runnning up to yesterday and I haven't fixed anything with the code. Keep updating)

Uncaught TypeError: Cannot read property 'prototype' of null
O
(anonymous function)
e
google.a.c.Xc
google.a.c.Oa
google.a.Oa
(anonymous function)

Update 20160301: Google has updated chart package to ver 44

google.charts.load('44', {'packages':['annotationchart'], 'language': 'ja'});

Testcode: https://jsfiddle.net/dsmgL9wj/17/ (Annotation Chart version 44)