Shape error when trying to use default mask/setting refine_enable to False

First of all, thanks for such a great project.
When trying to run demo.py and setting refine_enable to False, thus using the default mask, I`ve encountered an issue:
```
Traceback (most recent call last):
File "../../tools/demo.py", line 55, in
state = siamese_track(state, im, mask_enable=True, refine_enable=False, device=device) # track
File "/home/zeleniyslonik/PycharmProjects/SiamMask/tools/test.py", line 261, in siamese_track
mask = mask[0, :, delta_y, delta_x].sigmoid(). \
RuntimeError: shape '[127, 127]' is invalid for input of size 3969
```
I am running it on a default tennis demo. Can you give me any advice on how to properly implement the usage of the default mask? I need it to compare the results between the refined mask and itself. Thanks in advance.