iOS 应用的崩溃次数怎么可能比会话次数还多?

How can an iOS app have more crashes than sessions?

https://analytics.itunes.apple.com,对于我们公司的众多应用程序之一,我看到了这个:

Period: 30 days
Opt-in rate: 31%
Impressions | App Units | Opt-in Sessions | Opt-in Crashes
      3,089 |        27 |              17 |             42

其他信息:iOS 8+。

怎么crash比session还多?

根据 Medium 文章 (Apple App Analytics 101 (updated)):

Sessions

The number of times the app has been used for at least two seconds. If the app is in the background and is later used again, that counts as another session.

这意味着如果崩溃发生在应用启动的前两秒内,它不会注册为会话。