Android version is empty when FireFox Browser User Agent

[sowa-s]

I can not get Android version when FireFox Browser.

I request UserAgent to "Mozilla/5.0 (Android 7.0; Mobile; rv:50.0) Gecko/50.0 Firefox/50.0"

Result,
{name=Firefox, category=smartphone, os=Android, version=50.0, vendor=Mozilla}

not found "os_version" parameter

[nabedge]

I have same problem.

[tagomoris]

It's not the issue of woothee-java, but the issue of woothee/woothee.
Could you create an issue there? https://github.com/woothee/woothee/issues