x11-terms/guake-0.5.2 - guake opens a new session for each terminal

Atfer upgrading guake from 0.5.0 to 0.5.2 and opening, for an example, 10 tabs I see 10 logged users (with w or who), if I open 20 tabs, session also became 20.
When I exit from this tabs logged uses from w or who are still there.

Reproducible: Always

Steps to Reproduce:
1. Start guake
2. Open many tabs
3. Look to w or who
4. Close tabs
5. Look to w or who
Actual Results:
solnote-42x7-4 ~ # w
09:53:06 up 8 days, 16:06, 27 users, load average: 0.17, 0.26, 0.64
USER TTY LOGIN@ IDLE JCPU PCPU WHAT
sbobrov :0.0 Sat19 ?xdm? 12:47m 2.53s /usr/bin/mate-session
sbobrov pts/1 09:41 2.00s 0.66s 3.06s python2 -m guake.main
sbobrov pts/3 09:48 0.00s 0.00s 3.06s python2 -m guake.main
sbobrov pts/4 09:48 0.00s 0.00s 3.06s python2 -m guake.main
sbobrov pts/5 09:48 0.00s 0.00s 3.06s python2 -m guake.main
sbobrov pts/6 09:48 0.00s 0.00s 3.06s python2 -m guake.main
sbobrov pts/7 09:48 0.00s 0.00s 3.06s python2 -m guake.main
sbobrov pts/8 09:49 0.00s 0.00s 3.06s python2 -m guake.main
sbobrov pts/9 09:49 0.00s 0.00s 3.06s python2 -m guake.main
sbobrov pts/10 09:49 0.00s 0.00s 3.06s python2 -m guake.main
sbobrov pts/11 09:49 0.00s 0.00s 3.06s python2 -m guake.main
sbobrov pts/12 09:49 0.00s 0.00s 3.06s python2 -m guake.main
sbobrov pts/13 09:49 0.00s 0.00s 3.06s python2 -m guake.main
sbobrov pts/14 09:49 0.00s 0.00s 3.06s python2 -m guake.main
sbobrov pts/15 09:49 0.00s 0.00s 3.06s python2 -m guake.main
sbobrov pts/16 09:49 0.00s 0.00s 3.06s python2 -m guake.main
sbobrov pts/17 09:49 0.00s 0.00s 3.06s python2 -m guake.main
sbobrov pts/18 09:49 0.00s 0.00s 3.06s python2 -m guake.main
sbobrov pts/19 09:49 0.00s 0.00s 3.06s python2 -m guake.main
sbobrov pts/20 09:49 0.00s 0.00s 3.06s python2 -m guake.main
sbobrov pts/21 09:49 0.00s 0.00s 3.06s python2 -m guake.main
sbobrov pts/22 09:49 0.00s 0.00s 3.06s python2 -m guake.main
sbobrov pts/23 09:49 0.00s 0.00s 3.06s python2 -m guake.main
sbobrov pts/24 09:49 0.00s 0.00s 3.06s python2 -m guake.main
sbobrov pts/25 09:49 0.00s 0.00s 3.06s python2 -m guake.main
sbobrov pts/26 09:49 0.00s 0.00s 3.06s python2 -m guake.main
sbobrov pts/27 09:49 0.00s 0.00s 3.06s python2 -m guake.main

Expected Results:
sbobrov@solnote-42x7-4 ~ $ w
09:52:35 up 8 days, 16:06, 27 users, load average: 0,15, 0,27, 0,65
USER TTY LOGIN@ IDLE JCPU PCPU WHAT
sbobrov :0.0 Сб19 ?xdm? 12:47m 2.53s /usr/bin/mate-session
sbobrov pts/1 09:49 3.00s 0.00s 0.00s w

emerge --info https://bpaste.net/show/b6f8f2f2b9a1