IndexError: index -1 is out of bounds for axis 0 with size 0

[fanzz1208]

Points (1, 3) Visibility (1, 19)
Depth stats 199.47634294350073 205.96847091521676 202.9606774417559
Traceback (most recent call last):
File "imgs2poses.py", line 19, in
gen_poses(args.scenedir, args.match_type)
File "/workspace/LLFF/llff/poses/pose_utils.py", line 281, in gen_poses
save_poses(basedir, poses, pts3d, perm)
File "/workspace/LLFF/llff/poses/pose_utils.py", line 87, in save_poses
close_depth, inf_depth = np.percentile(zs, .1), np.percentile(zs, 99.9)
File "<array_function internals>", line 6, in percentile
File "/opt/conda/lib/python3.7/site-packages/numpy/lib/function_base.py", line 3868, in percentile
a, q, axis, out, overwrite_input, interpolation, keepdims)
File "/opt/conda/lib/python3.7/site-packages/numpy/lib/function_base.py", line 3988, in _quantile_unchecked
interpolation=interpolation)
File "/opt/conda/lib/python3.7/site-packages/numpy/lib/function_base.py", line 3564, in _ureduce
r = func(a, **kwargs)
File "/opt/conda/lib/python3.7/site-packages/numpy/lib/function_base.py", line 4098, in _quantile_ureduce_func
n = np.isnan(ap[-1])
IndexError: index -1 is out of bounds for axis 0 with size 0

How to solve it？？？