getting the following when trying to get albuminfo

Client region is US
[2022-07-07 18:58:57,166] ERROR in app: Exception on /cdinfo/GetMDRCD.aspx [GET]
Traceback (most recent call last):
File "C:\Users\purpe\AppData\Local\Programs\Python\Python310\lib\site-packages\flask\app.py", line 2447, in wsgi_app
response = self.full_dispatch_request()
File "C:\Users\purpe\AppData\Local\Programs\Python\Python310\lib\site-packages\flask\app.py", line 1952, in full_dispatch_request
rv = self.handle_user_exception(e)
File "C:\Users\purpe\AppData\Local\Programs\Python\Python310\lib\site-packages\flask\app.py", line 1821, in handle_user_exception
reraise(exc_type, exc_value, tb)
File "C:\Users\purpe\AppData\Local\Programs\Python\Python310\lib\site-packages\flask_compat.py", line 39, in reraise
raise value
File "C:\Users\purpe\AppData\Local\Programs\Python\Python310\lib\site-packages\flask\app.py", line 1950, in full_dispatch_request
rv = self.dispatch_request()
File "C:\Users\purpe\AppData\Local\Programs\Python\Python310\lib\site-packages\flask\app.py", line 1936, in dispatch_request
return self.view_functionsrule.endpoint
File "C:\Users\purpe\Downloads\PyZuneMetadataServer-main\app.py", line 32, in cd_get_album
ToC = ToC.replace(" ", "+")
AttributeError: 'NoneType' object has no attribute 'replace'
192.168.50.77 - - [07/Jul/2022 18:58:57] "GET /cdinfo/GetMDRCD.aspx?locale=409&geoid=f4&version=11.0.6002.19378&userlocale=409&wmid=208F236E-B511-4949-BDF9-3791602ED53A HTTP/1.1" 500 -