Matomo 3.9.1版本只是比上一个版本（3.9.0版本）解决了4个问题，所以如果你用的是3.9.0版本，请一定要升级到3.9.1版本，如下：
- #14229 Notice – unserialize(): Error at offset 0 of 53988 bytes
- #14226 open_basedir restriction AND Support multiple plugin paths [by @sgiehl]
- #14227 One-click upgrade sometimes fails with errors such as “Call to undefined method Piwik\Plugin\Manager::getPluginDirectory() ” (fails only once, works after a refresh)
- #14240 Do not send password changed email for automated use cases. [by @diosmosis, @sgiehl]