TypeError: int() argument must be a string, a bytes-like object or a number, not 'filter'

[htam-har]

Traceback (most recent call last):
File "C:\xxx\Desktop\poe\jewel tool\scripts\analyzer.py", line 410, in
analyzeJewels(dirs["jewel"])
File "C:\xxx\Desktop\poe\jewel tool\scripts\analyzer.py", line 299, in analyzeJewels
nodes = imagesInDirToStrings(jewelDir)
File "C:\xxx\Desktop\poe\jewel tool\scripts\analyzer.py", line 31, in imagesInDirToStrings
files = Helpers.getFilesByExtFromDir(dir, ".png")
File "C:\xxx\Desktop\poe\jewel tool\scripts\helpers.py", line 80, in getFilesByExtFromDir
files.sort(key=lambda f: int(filter(str.isdigit, f)))
File "C:\xxx\Desktop\poe\jewel tool\scripts\helpers.py", line 80, in
files.sort(key=lambda f: int(filter(str.isdigit, f)))