some sort of error in robot_controller

[mjsobrep]

Traceback (most recent call last):
  File "/home/nuc-admin/catkin_ws/src/LilFloSystem/flo_humanoid/src/robot_controller.py", line 753, in <module>
    CONTROLLER = BolideController()
  File "/home/nuc-admin/catkin_ws/src/LilFloSystem/flo_humanoid/src/robot_controller.py", line 174, in __init__
    self.read_loop()
  File "/home/nuc-admin/catkin_ws/src/LilFloSystem/flo_humanoid/src/robot_controller.py", line 332, in read_loop
    self.upload_sequence([self.current_positions], [0])
  File "/home/nuc-admin/catkin_ws/src/LilFloSystem/flo_humanoid/src/robot_controller.py", line 556, in upload_sequence
    self.upload_poses(poses)
  File "/home/nuc-admin/catkin_ws/src/LilFloSystem/flo_humanoid/src/robot_controller.py", line 525, in upload_poses
    if not ret['command'] == self.feedback['keep_going']:
TypeError: 'NoneType' object has no attribute '__getitem__'