AttributeError: 'NoneType' object has no attribute 'poly_data'

(Please fill in this issue template with as much information as you can about the circumstances under which the issue occurred, and the steps needed to reproduce it.)

Steps to reproduce the problem

(provide as detailed a step by step as you can)

just traing to change tool in the main tab page

This is what I expected to happen

(explain what you thought should have happened)

This is what happened instead

(explain what happened instead)

It worked properly before this

(did it work before? what changed?)

Traceback

Traceback (most recent call last):
  File "/home/cnc/.local/lib/python2.7/site-packages/qtpyvcp/widgets/display_widgets/vtk_backplot/vtk_backplot.py", line 397, in load_program
    self.canon.draw_lines()
  File "/home/cnc/.local/lib/python2.7/site-packages/qtpyvcp/widgets/display_widgets/vtk_backplot/vtk_backplot.py", line 220, in draw_lines
    path_actor.poly_data.SetPoints(path_actor.points)
AttributeError: 'NoneType' object has no attribute 'poly_data'

Options

{
    "command_line_args": null, 
    "config_file": null, 
    "confirm_exit": null, 
    "develop": false, 
    "fullscreen": true, 
    "help": false, 
    "hide_cursor": false, 
    "hide_menu_bar": false, 
    "hide_status_bar": false, 
    "ini": "/home/cnc/linuxcnc/configs/GnevkoVCP/GnevkoVCP.ini", 
    "log_file": "/home/cnc/qtpyvcp.log", 
    "log_level": null, 
    "maximize": true, 
    "perfmon": false, 
    "position": "0x0", 
    "pref_file": null, 
    "qt_api": null, 
    "size": "1920x1080", 
    "stylesheet": null, 
    "theme": null, 
    "version": false
}

System Info

 * Description: Debian GNU/Linux 10 (buster)
 * Kernel: 4.19.0-12-rt-amd64
 * Qt version: v5.11.3
 * Qt bindings: PyQt5 v5.11.3
 * LinuxCNC version: v2.9.0-pre0-2909-gca06fc273
 * QtPyVCP version: v0.3.6

Attachments

Please also find and attach the following files, along with any others that may be helpful:

/home/cnc/qtpyvcp.log
None

kcjengr / qtpyvcp

AttributeError: 'NoneType' object has no attribute 'poly_data' #55