Webalizer shows only 2 months on summary page

[us2000]

Webalizer is used since January, but shows only only 2 months on summary page.
Data are available, but were not displayed.

$ ls -ls /var/www/webalizer
-rwxr-xr-x 1 root root 5446 Feb 1 10:19 ctry_usage_201501.png
-rwxr-xr-x 1 root root 5426 Mar 1 10:19 ctry_usage_201502.png
-rwxr-xr-x 1 root root 5378 Apr 1 10:19 ctry_usage_201503.png
-rwxr-xr-x 1 root root 5471 May 1 10:19 ctry_usage_201504.png
-rwxr-xr-x 1 root root 5427 Jun 1 10:19 ctry_usage_201505.png
-rwxr-xr-x 1 root root 5686 Jul 1 10:19 ctry_usage_201506.png
-rwxr-xr-x 1 root root 5699 Jul 4 08:47 ctry_usage_201507.png
-rwxr-xr-x 1 root root 3224 Feb 1 10:19 daily_usage_201501.png
-rwxr-xr-x 1 root root 4227 Mar 1 10:19 daily_usage_201502.png
-rwxr-xr-x 1 root root 4189 Apr 1 10:19 daily_usage_201503.png
-rwxr-xr-x 1 root root 4504 May 1 10:19 daily_usage_201504.png
-rwxr-xr-x 1 root root 3573 Jun 1 10:19 daily_usage_201505.png
-rwxr-xr-x 1 root root 4308 Jul 1 10:19 daily_usage_201506.png
-rwxr-xr-x 1 root root 2809 Jul 4 08:47 daily_usage_201507.png
-rwxr-xr-x 1 root root 2164 Feb 1 10:19 hourly_usage_201501.png
-rwxr-xr-x 1 root root 2343 Mar 1 10:19 hourly_usage_201502.png
-rwxr-xr-x 1 root root 2215 Apr 1 10:19 hourly_usage_201503.png
-rwxr-xr-x 1 root root 2317 May 1 10:19 hourly_usage_201504.png
-rwxr-xr-x 1 root root 2323 Jun 1 10:19 hourly_usage_201505.png
-rwxr-xr-x 1 root root 2228 Jul 1 10:19 hourly_usage_201506.png
-rwxr-xr-x 1 root root 2202 Jul 4 08:47 hourly_usage_201507.png
-rwxr-xr-x 1 root root 4321 Jul 4 08:47 index.html
-rwxr-xr-x 1 root root 115605 Feb 1 10:19 usage_201501.html
-rwxr-xr-x 1 root root 139841 Mar 1 10:19 usage_201502.html
-rwxr-xr-x 1 root root 154241 Apr 1 10:19 usage_201503.html
-rwxr-xr-x 1 root root 143611 May 1 10:19 usage_201504.html
-rwxr-xr-x 1 root root 145712 Jun 1 10:19 usage_201505.html
-rwxr-xr-x 1 root root 142223 Jul 1 10:19 usage_201506.html
-rwxr-xr-x 1 root root 84409 Jul 4 08:47 usage_201507.html
-rwxr-xr-x 1 root root 2428 Jul 4 08:47 usage.png
-rwxr-xr-x 1 root root 461068 Jul 4 08:47 webalizer.current
-rwxr-xr-x 1 root root 3393 Jul 4 08:47 webalizer.hist

$ head webalizer.hist
# Webalizer V2.23-08 History Data - 04/Jul/2015 08:47:01 (120 month)
7 2015 51116 45249 10517 3229469 1 4 5915 3151 0 0
6 2015 513833 451201 87293 32428114 1 30 63116 36223 0 0
5 2015 0 0 0 0 0 0 0 0 0 0
4 2015 0 0 0 0 0 0 0 0 0 0
3 2015 0 0 0 0 0 0 0 0 0 0
2 2015 0 0 0 0 0 0 0 0 0 0
1 2015 0 0 0 0 0 0 0 0 0 0
12 2014 0 0 0 0 0 0 0 0 0 0
11 2014 0 0 0 0 0 0 0 0 0 0

$ egrep -i -v "^$|^#" /etc/webalizer/webalizer2.conf
LogFile /var/log/lighttpd/access.log
OutputDir /var/www/webalizer
Incremental yes
GeoDB yes
CountryFlags yes
FlagDir flags
...
... rest at default

$ dpkg -l | egrep webalizer
ii webalizer 2.23.08-1 amd64 web server log analysis program

Problem on several Ubuntu server.
Also found this: http://askubuntu.com/questions/638887/webalizer-shows-only-2-months-on-summary-page-ubuntu-14-04

[us2000 (q-launchpad-r)]

$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 15.04
Release: 15.04
Codename: vivid

[us2000 (q-launchpad-r)]

To be more specific I have attached an example.

See the screen-shot from 2015-08-31 and 2015-09-01.

On 2015-08-31 you can see full data for month Jul. and Aug.

On 2015-09-01 you can see: Jul. is suddenly missing.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Ramiro (ramiro-romero)]

shows only 2 months, we have updated the latest version

# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 14.04.3 LTS
Release: 14.04
Codename: trusty

[soft-worker (soft-worker)]

Same Problem 2017!

[us2000 (q-launchpad-r)]

Patch here:
https://bugs.launchpad.net/ubuntu/+source/webalizer/+bug/1399615