error for notes without field

[TentativeConvert]

Need to test whether any field exists!

in source:

\begin{note}{LinA-I-Gruppen-Kriterien-Untergruppe}
\end{note}

output:

WARNING: unrecognized command/environment: None
ERROR: Error while expanding "end" in <tokens> on line 1 (type.__new__()
   argument 1 must be str, not None)
ERROR: An error occurred while building the document object in <tokens> on
   line 1 (type.__new__() argument 1 must be str, not None)
ERROR: Error while reading argument "self" of note in ./LinACards2025.tex
   on line 500 (type.__new__() argument 1 must be str, not None)
ERROR: Error while parsing argument "self" of "note"
ERROR: Error while expanding "begin" in ./LinACards2025.tex on line 500
   (type.__new__() argument 1 must be str, not None)
ERROR: An error occurred while building the document object in
   ./LinACards2025.tex on line 500 (type.__new__() argument 1 must be str, not
   None)
Traceback (most recent call last):
  File "/home/marcus/.local/bin/plastex", line 8, in <module>
    sys.exit(plastex())
  File "/home/marcus/.local/lib/python3.8/site-packages/plasTeX/client.py", line 72, in plastex
    main(sys.argv[1:])
  File "/home/marcus/.local/lib/python3.8/site-packages/plasTeX/client.py", line 52, in main
    run(filename, config)
  File "/home/marcus/.local/lib/python3.8/site-packages/plasTeX/Compile.py", line 90, in run
    tex = parse(filename, config)
  File "/home/marcus/.local/lib/python3.8/site-packages/plasTeX/Compile.py", line 85, in parse
    tex.parse()
  File "/home/marcus/.local/lib/python3.8/site-packages/plasTeX/TeX.py", line 416, in parse
    item.digest(tokens)
  File "/home/marcus/.local/lib/python3.8/site-packages/plasTeX/__init__.py", line 913, in digest
    for item in tokens:
  File "/home/marcus/.local/lib/python3.8/site-packages/plasTeX/TeX.py", line 44, in __next__
    return self._next()
  File "/home/marcus/.local/lib/python3.8/site-packages/plasTeX/TeX.py", line 322, in __iter__
    tokens = obj.invoke(self)
  File "/home/marcus/.local/lib/python3.8/site-packages/plasTeX/Base/LaTeX/Environments.py", line 32, in invoke
    out = obj.invoke(tex)
  File "/home/marcus/.local/lib/python3.8/site-packages/plasTeX/__init__.py", line 899, in invoke
    self.parse(tex)
  File "/home/marcus/.local/lib/python3.8/site-packages/plasTeX/__init__.py", line 481, in parse
    output, source = tex.readArgumentAndSource(parentNode=self,
  File "/home/marcus/.local/lib/python3.8/site-packages/plasTeX/TeX.py", line 743, in readArgumentAndSource
    toks, source = self.readToken(expanded, parentNode=parentNode)
  File "/home/marcus/.local/lib/python3.8/site-packages/plasTeX/TeX.py", line 829, in readToken
    toks = self.expandTokens(toks, parentNode=parentNode)
  File "/home/marcus/.local/lib/python3.8/site-packages/plasTeX/TeX.py", line 385, in expandTokens
    out = tex.parse(frag)
  File "/home/marcus/.local/lib/python3.8/site-packages/plasTeX/TeX.py", line 413, in parse
    for item in tokens:
  File "/home/marcus/.local/lib/python3.8/site-packages/plasTeX/TeX.py", line 44, in __next__
    return self._next()
  File "/home/marcus/.local/lib/python3.8/site-packages/plasTeX/TeX.py", line 322, in __iter__
    tokens = obj.invoke(self)
  File "/home/marcus/.local/lib/python3.8/site-packages/plasTeX/Base/LaTeX/Environments.py", line 49, in invoke
    obj = self.ownerDocument.createElement(name)
  File "/home/marcus/.local/lib/python3.8/site-packages/plasTeX/__init__.py", line 860, in createElement
    elem = self.context[name]()
  File "/home/marcus/.local/lib/python3.8/site-packages/plasTeX/Context.py", line 643, in __getitem__
    self[key] = newclass = type(key, (plasTeX.UnrecognizedMacro,), {})
TypeError: type.__new__() argument 1 must be str, not None