Cancel button not working

[Syco]

If I right click on the icon and do "Show last push" the window appear correctly, but the Cancel button doesn't do anything.
If I press ESC on my keyboard window is closed correctly.

it runs on archlinux + cinnamon, here is output from the console:

$ /usr/bin/python3 /opt/extras.ubuntu.com/pushbullet-indicator/bin/pushbullet-indicator
/opt/extras.ubuntu.com/pushbullet-indicator/share/pushbullet-indicator
/opt/extras.ubuntu.com/pushbullet-commons/share/pushbullet-commons
--------------------------
/opt/extras.ubuntu.com/pushbullet-commons/share/pushbullet-commons
Getting last push
[]
--------------------------
WebSocketClient 2015-04-14 15:57:42 {'type': 'nop'}
/opt/extras.ubuntu.com/pushbullet-indicator/share/pushbullet-indicator/pushbullet_indicator.py:445: Warning: The property GtkSettings:gtk-menu-images is deprecated and shouldn't be used anymore. It will be removed in a future version.
  web.set_image(Gtk.Image.new_from_file(os.path.join(comun.SOCIALDIR,'web.svg')))

/usr/lib/python3.4/site-packages/gi/overrides/Gtk.py:567: Warning: The property GtkButton:use-stock is deprecated and shouldn't be used anymore. It will be removed in a future version.
  self.add_button(text, response)
/usr/lib/python3.4/site-packages/gi/overrides/Gtk.py:567: Warning: The property GtkSettings:gtk-button-images is deprecated and shouldn't be used anymore. It will be removed in a future version.
  self.add_button(text, response)
Gtk-Message: GtkDialog mapped without a transient parent. This is discouraged.
Traceback (most recent call last):
  File "/opt/extras.ubuntu.com/pushbullet-indicator/share/pushbullet-indicator/pushbullet_indicator.py", line 575, in on_show_last_push_clicked
    actionDialog = ActionDialog(self.last_push,None,None)
  File "/opt/extras.ubuntu.com/pushbullet-commons/share/pushbullet-commons/pushbullet_dialogs.py", line 470, in __init__
    self.notebook.remove_page(LIST_PAGE)
NameError: name 'LIST_PAGE' is not defined

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On destroy kill the watchdog if any
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