Using Disco Diffusion V5.2 - Attributeerror: 'Nonetype' Object Has No Attribute 'Shape'

I'm trying to run a few keyframe prompts for an animation test, however after the run starts and a haze based image forms, it only completes the first few passes and then hits me with this:

Seed used: 1412665177
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AttributeError                            Traceback (most recent call last)
<ipython-input-19-95fd5446980a> in <module>()
    171 torch.cuda.empty_cache()
    172 try:
--> 173     do_run()
    174 except KeyboardInterrupt:
    175     pass

<ipython-input-8-f0c50060b30a> in do_run()
    366           else:
    367             img_0 = cv2.imread('prevFrame.png')
--> 368           center = (1*img_0.shape[1]//2, 1*img_0.shape[0]//2)
    369           trans_mat = np.float32(
    370               [[1, 0, translation_x],

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

So far I've not been able to figure it out through normal StackOverflow answers.