Importing Apache log

I’m importing Apache logs since some years and it worked OK.
Since Update to Matome 3.13.0 on 28.11. the number of unique visitors is way to high

The number of loglines the days before are about at the same magnitude, but the number of unique visitors was suddenly a huge factor higher (2400 vs 52000)

This is no bug.
The meaning/counting of visits has changed in 3.13.
The log has a userid and this userid is transferred in the uid-parameter.
Now almost every logline is a visit, before every different uid was counted as a visit
The previous behaviour can be seen by selecting users in place of visits