Are you using fetch and render from google webmaster tools while to trigger
it while you are in development mode?
On Feb 27, 2016 18:01, "Ed Bras" <[email protected]> wrote:

> Ofcourse that is possible, but that is not an option in production.
>
> On 27 February 2016 at 16:10, Rogelio Flores <[email protected]>
> wrote:
>
>> If you compile your app with the "PRETTY" compiler flag and then deploy
>> it and run the same test, you might know exactly what "Kg" is (what its
>> real name is on your Java code) which hopefully will let you know exactly
>> what is failing and why.
>>
>>
>> On Friday, February 26, 2016 at 2:29:21 AM UTC-7, Ed wrote:
>>>
>>> Ok, Still googlebot comes a long and after I deployed a new version I
>>> always get google bot exceptions.
>>>
>>> I checked the permutation, and that often seem to be ok (not always).
>>> That is: the one I receive as http header is the same as the one that I
>>> send a long to the backend when an exception occurs.
>>>
>>> The error I get:
>>> ---
>>>
>>> (TypeError) : Cannot call method 'Kg' of null
>>>
>>> at Unknown.vSb(https://www.leuker.nl/app/aangifte/start/)
>>>
>>>
>>>
>>>
>>>
>>>
>>> ---
>>>
>>> Any idea ?
>>> I think it might come with the JS engine that googlebot uses. For
>>> example: I don't support IE9, as I use JS features that aren't supported by
>>> IE9 that result in similar errors.
>>> But how to work around this? It's hard to see the exact error that
>>> occurs.
>>>
>>> - Ed
>>>
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