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Call to a member function isHidden() on a non-object (null)
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From Kibana:

[{exception_id}] {exception_url} BadMethodCallException from line 96 of /srv/mediawiki/php-1.31.0-wmf.17/extensions/Flow/includes/View.php: Call to a member function isHidden() on a non-object (null)

Event Timeline

Restricted Application added a subscriber: Aklapper. · View Herald Transcript

There is no Fatal-Monitor in logstash-beta. Currently, logstash.wikimedia shows 401 count of such error

[{exception_id}] {exception_url} BadMethodCallException from line 96 of /srv/mediawiki/php-1.31.0-wmf.17/extensions/Flow/includes/View.php: Call to a member function isHidden() on a non-object (null)	401

I will need to monitor it for while after deployment.

In betalabs, noindex, nofollow is added to the 'access denied' topic page.

Checked after deployment - no errors are surfaced.