Problem with the scrip - Githubissues

Hi when I run the script, I get a couple of warnings and at the end an error with the script so it seems
What can I do, can you help me?
DINGER-2:swinsian2itlxml-master dinger$ ./swinsian2itlxml.py -x fynn.xml
2022-09-10 13:33:53 INFO: Opening Swinsian database '/Users/dinger/Library/Application Support/Swinsian/Library.sqlite'...
2022-09-10 13:33:53 INFO: Generating track information...
2022-09-10 13:33:54 WARNING: Jandl, bierrmann / 09 Strickleiter (Jandl) has a play date earlier than date added, 2013-10-02 11:16:00 [play date] < 2013-11-09 01:41:44 [date added]
2022-09-10 13:33:54 WARNING: Retag! / Harry Rowohlt liest Flann O'Brien - has a play date earlier than date added, 2013-08-24 14:53:00 [play date] < 2013-11-09 01:49:14 [date added]
2022-09-10 13:33:54 WARNING: Nancy Sinatra / Theses Boots Ar has a play date earlier than date added, 2013-08-23 22:35:00 [play date] < 2013-11-09 01:50:00 [date added]
2022-09-10 13:33:54 WARNING: Jozif / Guitar Player (Original Mix) has a play date earlier than date added, 2013-04-20 02:22:00 [play date] < 2013-11-09 01:52:03 [date added]
2022-09-10 13:33:55 WARNING: Plastikman  / headcase has a play date earlier than date added, 2014-02-26 18:57:36 [play date] < 2014-07-09 20:53:02 [date added]
2022-09-10 13:33:55 WARNING: Plastikman  / i don't know has a play date earlier than date added, 2014-06-22 15:01:02 [play date] < 2014-07-09 20:55:28 [date added]
2022-09-10 13:33:55 WARNING: Amount / Weisshorn_URS004 has a play date earlier than date added, 2014-09-09 11:36:29 [play date] < 2014-10-11 01:23:28 [date added]
2022-09-10 13:33:55 WARNING: Walker & Royce / A Perfect Sound feat. Louisahhh! (Original Mix) has a play date earlier than date added, 2014-10-31 21:59:06 [play date] < 2015-01-05 21:00:34 [date added]
2022-09-10 13:33:55 WARNING: Cagedbaby / Forced (Full_Force_Idiotproof_Remix) has a play date earlier than date added, 2014-08-05 06:03:32 [play date] < 2015-01-11 12:20:42 [date added]
2022-09-10 13:33:55 WARNING: Rich Vom Dorf / Begin Gro (The Chosen Two Remix) has a play date earlier than date added, 2014-10-31 23:52:32 [play date] < 2015-04-12 01:39:49 [date added]
2022-09-10 13:33:55 WARNING: Slumber, Guada FX / Nightwalkers feat. Guada FX (Elia Crecchi Remix) has a play date earlier than date added, 2014-10-31 22:52:18 [play date] < 2015-04-12 01:39:49 [date added]
2022-09-10 13:33:55 WARNING: None / Golden Brown (The Apple Scruffs Edit) has a play date earlier than date added, 2014-09-22 07:44:37 [play date] < 2015-11-03 23:14:10 [date added]
2022-09-10 13:33:55 WARNING: None / Sedna lo to kullen3-- 1.mix 13.11   has a play date earlier than date added, 2015-02-19 19:19:08 [play date] < 2015-11-04 00:08:45 [date added]
2022-09-10 13:33:55 WARNING: None / morning walk (tadpole´s oriental mix) has a play date earlier than date added, 2015-02-24 16:10:23 [play date] < 2015-11-04 00:11:54 [date added]

Traceback (most recent call last):
  File "./swinsian2itlxml.py", line 352, in <module>
    main()
  File "./swinsian2itlxml.py", line 347, in main
    itunes_music_folder=args.itunes_music_folder)
  File "./swinsian2itlxml.py", line 174, in generate_xml
    total_time = int(math.ceil(row["length"] * 1000))
TypeError: unsupported operand type(s) for *: 'NoneType' and 'int'
mhite / swinsian2itlxml

Problem with the scrip #7
