Occasional error when starting up with Allied Vision camera

[frogran]

2025-24-02 16:26:18 ERROR    AlliedVisionImageSource:top Exception while getting image from alliedVision camera:
Traceback (most recent call last):
  File "/home/tal/dev/reptiLearn/system/image_sources/allied_vision_cameras.py", line 110, in _frame_hander
    timestamp = frame.get_timestamp() / 1e9 + self.camera_time_delta
TypeError: unsupported operand type(s) for /: 'NoneType' and 'float'