PyDesigner IRLLS Outlier Detection Error

Could someone please help me determine why PyDesigner throws this error?

IRLLS Outlier Detection: [100%]
…metrics_qc/fitting/outliers_irlls.nii
Plotting outliers… [0. 0. 0. 0. 0. 0. 0. 0.]
Traceback (most recent call last):
ValueError: Invalid RGBA argument: 0.0

What do I think is going on?
There are no outliers detected.
Plotting outliers…
[0. 0. 0. 0. 0. 0. 0. 0.]

  • An error occurs because the code is attempting to plot non-existent outliers.