TypeError: '<' not supported between instances of 'str' and 'int'

[michaelneuper]

calibre, version 6.15.1
ERROR: Unhandled exception: TypeError:'<' not supported between instances of 'str' and 'int'

calibre 6.15.1 embedded-python: False
Linux-6.2.10-zen1-1-zen-x86_64-with-glibc2.37 Linux ('64bit', 'ELF')
('Linux', '6.2.10-zen1-1-zen', '#1 ZEN SMP PREEMPT_DYNAMIC Fri, 07 Apr 2023 02:10:16 +0000')
Python 3.10.10
Interface language: None
Successfully initialized third party plugins: Goodreads (1, 7, 6) && KOReader Sync (0, 4, 1) && Kindle Collections (1, 7, 29) && Kindle hi-res covers (0, 5, 0) && Kobo Books (1, 9, 2)
Traceback (most recent call last):
File "calibre_plugins.koreader.action", line 495, in sync_to_calibre
value = column'transform'
File "calibre_plugins.koreader.config", line 116, in
'transform': (lambda d: json.dumps(
File "/usr/lib/python3.10/json/init.py", line 238, in dumps
**kw).encode(obj)
File "/usr/lib/python3.10/json/encoder.py", line 201, in encode
chunks = list(chunks)
File "/usr/lib/python3.10/json/encoder.py", line 431, in _iterencode
yield from _iterencode_dict(o, _current_indent_level)
File "/usr/lib/python3.10/json/encoder.py", line 405, in _iterencode_dict
yield from chunks
File "/usr/lib/python3.10/json/encoder.py", line 353, in _iterencode_dict
items = sorted(dct.items())
TypeError: '<' not supported between instances of 'str' and 'int'

[Hyphen-ated]

It looks like you're using upstream version 0.4.1 of this plugin, rather than my fork. So you're in the wrong place. Also there have been two newer releases of upstream since 0.4.1, try updating.