Large number of popup events not validating due to duration being null:
2015-03-01 06:42:21,795 (MainThread) Unable to decode: ?%7B%22event%22%3A%7B%22duration%22%3Anull%7D%2C%22revision%22%3A7536956%2C%22schema%22%3A%22Popups%22%2C%22webHost
%22%3A%22zh.wikipedia.org%22%2C%22wiki%22%3A%22zhwiki%22%7D; cp1069.eqiad.wmnet 41274030 2015-03-01T06:42:21 10.64.0.106 Mozilla/5.0 (Macintosh; In
tel Mac OS X 10_10_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/40.0.2214.115 Safari/537.36
(None is not of type u'integer'
Failed validating u'type' in schema[u'properties'][u'event'][u'properties'][u'duration']:
{u'description': u'Duration in milliseconds for how long the popup was displayed.',
u'required': True,
u'type': u'integer'}