Program crashes when trying to use a custom image as an indicator

[Yusuf Mohammed Habeeb]

As said in the summary, the program crashes while trying to change the indicator icon to a custom image from the preferences > customize tab.

Version of variety: 0.4.20

Enviroment: Unity

Ubutntu 14.04 LTS x64 on a macbook pro

Variety Log when producing the bug:

INFO: 2014-12-10 10:30:49,657: apply() 'Applying preferences'
ERROR: 2014-12-10 10:30:49,664: apply() 'Error while applying preferences'
Traceback (most recent call last):
  File "/opt/extras.ubuntu.com/variety/variety/PreferencesVarietyDialog.py", line 815, in apply
    file = _u(self.ui.icon_chooser.get_filename())
  File "/opt/extras.ubuntu.com/variety/variety/__init__.py", line 23, in _u
    return unicode(s, 'utf8')
TypeError: coercing to Unicode: need string or buffer, NoneType found

(variety:16158): Gdk-ERROR **: The program 'variety' received an X Window System error.
This probably reflects a bug in the program.
The error was 'BadDrawable (invalid Pixmap or Window parameter)'.
  (Details: serial 11405 error_code 9 request_code 130 (MIT-SHM) minor_code 5)
  (Note to programmers: normally, X errors are reported asynchronously;
   that is, you will receive the error a while after causing it.
   To debug your program, run it with the GDK_SYNCHRONIZE environment
   variable to change this behavior. You can then get a meaningful
   backtrace from your debugger if you break on the gdk_x_error() function.)
Trace/breakpoint trap (core dumped)

the problem happens every time I try to do this, no matter if doing it after the system start up or when launching variety manually,