synapse-indicator crashes xfce4 indicator panel-plugin

[cellstorm]

with synapse-indicator installed, adding xfce4-indicator-plugin to an xfce4-panel is not possible.
It worked before, but since I updated to xfce4.12 it crashes.

ppa:xubuntu-dev/xfce-4.12

Linux Ubuntu 3.16.0-33-generic #44~14.04.1-Ubuntu SMP Fri Mar 13 10:33:29 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

.cache/xfce4-indicator-plugin.log :

DEBUG libindicator-plugin Looking at Module: libapplication.so
DEBUG libindicator-plugin Loading Module: libapplication.so
DEBUG libindicator-plugin Load indicator: libapplication.so
DEBUG libindicator-plugin Looking at Module: libsynapse.so
DEBUG libindicator-plugin Loading Module: libsynapse.so
WARNING libindicator Unable to load module: /usr/lib/indicators3/7/libsynapse.so
DEBUG libindicator-plugin Load indicator: libsynapse.so
CRITICAL GLib-GObject g_object_set_data: assertion 'G_IS_OBJECT (object)' failed
WARNING GLib-GObject invalid (NULL) pointer instance
CRITICAL GLib-GObject g_signal_connect_data: assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed
WARNING GLib-GObject invalid (NULL) pointer instance
CRITICAL GLib-GObject g_signal_connect_data: assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed
CRITICAL libindicator get_all_entries: assertion 'INDICATOR_IS_OBJECT(io)' failed

gdb run:

(gdb) run
Starting program: /usr/bin/xfce4-panel
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
xfce4-panel: Failed to connect to session manager: Failed to connect to the session manager: Authentication Rejected, reason : None of the authentication protocols specified are supported and host-based authentication failed
[New Thread 0x7fffe22d3700 (LWP 8869)]
[New Thread 0x7fffe0ab3700 (LWP 8870)]

** (wrapper-1.0:8872): WARNING **: No outputs have backlight property
[New Thread 0x7fffdadde700 (LWP 8876)]
[New Thread 0x7fffda5dd700 (LWP 8877)]
[Thread 0x7fffdadde700 (LWP 8876) exited]

(wrapper-2.0:8879): GLib-GObject-CRITICAL **: g_object_set_data: assertion 'G_IS_OBJECT (object)' failed

(wrapper-2.0:8879): GLib-GObject-CRITICAL **: g_signal_connect_data: assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed

(wrapper-2.0:8879): GLib-GObject-CRITICAL **: g_signal_connect_data: assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed

(wrapper-2.0:8879): libindicator-CRITICAL **: get_all_entries: assertion 'INDICATOR_IS_OBJECT(io)' failed
xfce4-panel-Message: Plugin indicator-19 has been automatically restarted after crash.

(wrapper-2.0:8887): GLib-GObject-CRITICAL **: g_object_set_data: assertion 'G_IS_OBJECT (object)' failed

(wrapper-2.0:8887): GLib-GObject-CRITICAL **: g_signal_connect_data: assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed

(wrapper-2.0:8887): GLib-GObject-CRITICAL **: g_signal_connect_data: assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed

(wrapper-2.0:8887): libindicator-CRITICAL **: get_all_entries: assertion 'INDICATOR_IS_OBJECT(io)' failed
[Thread 0x7fffda5dd700 (LWP 8877) exited]

syslog:
04/07/15 01:22:59 PM openArtist kernel [46567.145904] panel-27-indica[10784]: segfault at 18 ip 00007fffef026289 sp 00007fffffffd100 error 4 in libindicator3.so.7.0.0[7fffef020000+11000]