Can't run with "TypeError: cannot create weak reference to 'NodeController' object"

[130s]

On ROS Groovy, Ubuntu Precise

isaito@btt:/groovy/catkin_ws/src/rxlaunch$ ./rxlaunch.py test.launch 
UUID: 267dd4c4-48a0-11e2-8ffb-0025901416d6

SUMMARY
========

PARAMETERS
 * /rosdistro
 * /rosversion
 * /x

MACHINES


NODES
  /
    listener (rospy_tutorials/listener)
    talker (rospy_tutorials/talker)

MASTER http://btt:11311/
... load_parameters complete
Traceback (most recent call last):
  File "./rxlaunch.py", line 357, in <module>
    if __name__ == '__main__': main()
  File "./rxlaunch.py", line 343, in main
    form = RxlaunchApp(sys.argv)
  File "./rxlaunch.py", line 224, in __init__
    start_button.clicked.connect(node_controller.start) 
TypeError: cannot create weak reference to 'NodeController' object

[130s]

Same error is reported in ros-visualization/rqt_common_plugins#422, for the same Python component that is taken from this repo (by myself).

[130s]

For rqt_launch ros-visualization/rqt_common_plugins#423 fixes the issue for ROS Kinetic.
For rxlaunch, which is EOLed project, I'm not interested in fixing, so leave this ticket open.