TypeError: sequence item 3: expected str instance, NoneType found

[nathmo]

Hi, thanks for this wonderful plugins and the work you put in.
I experience this issue :

File "PhotoFaceTagger.py", line 71, in main
    bar.update(step=picIndex)
  File "/home/nathann/PycharmProjects/PhotoFaceTagger/venv/lib/python3.8/site-packages/loadbar/LoadBar.py", line 100, in update
    s = ' '.join(l)
TypeError: sequence item 3: expected str instance, NoneType found

i managed to "Fix" it by changing

s = ' '.join(l)

with this dirty hack

        try:
            s = ' '.join(l)
        except:
            s = ' '.join(str(l))

Now the program run and the bar is crudely displayed (see bellow). Would you happen to have an Idea of why the issue happen and how to fix it.

[ ' 4 2 / 4 6 6 9 3 ' , ' ( 0 % ) ' , ' [ . ] ' , N o n e ]

(for reference here is my snippet of code that crashed it)

picIndex = 1
bar = LoadBar(max=corpusSize)  # display a not too verbose % of the work done
for pic in listOfPictures:  # this list contain 46 k pictures
     bar.update(step=picIndex) # 
    picIndex = picIndex + 1
bar.end()