[User 224999]

It is absolutely OK, that your script can only DL images, when they are found online. I wanted to point to the python error:

Code:

Skin Helper Service --> WebServer error in request --> [Errno 32] Broken pipe
14:15:20 186.406555 T:1749496736   ERROR: Traceback (most recent call last):
14:15:20 186.406693 T:1749496736   ERROR:   File "/storage/.kodi/addons/script.skin.helper.service/resources/lib/WebService.py", line 64, in __init__
14:15:20 186.406876 T:1749496736   ERROR:     SimpleHTTPServer.SimpleHTTPRequestHandler.__init__(self, request, client_address, server)
14:15:20 186.406937 T:1749496736   ERROR:   File "/usr/lib/python2.7/SocketServer.py", line 657, in __init__
14:15:20 186.407089 T:1749496736   ERROR:   File "/usr/lib/python2.7/SocketServer.py", line 716, in finish
14:15:20 186.407227 T:1749496736   ERROR:   File "/usr/lib/python2.7/socket.py", line 283, in close
14:15:20 186.407349 T:1749496736   ERROR:   File "/usr/lib/python2.7/socket.py", line 307, in flush
14:15:20 186.407639 T:1749496736   ERROR: error: [Errno 32] Broken pipe

This does not look good in the logs. Can you fix it please? If no image is found, there shouldn't be a "Broken pipe" error.
BTW: I tested it also with the latest version from today and the versions before.
Thx for this awesome script

You have enabled debug logging, that way all internal exceptions are printed on the log. Disable debug logging and they won't be visible.
If you want to prevent the 404 error, just set the fallback image in the request