New GitHub issue #96264 from HGStyle:<br>
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<pre>
Hi, when i call the function "guess_extension" from the mimetypes module, i get an error :
```
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/home/hg/Bureau/ezConverter/module.py", line 14, in getRealExtension
currentext = mime.guess_extension(x[0])
File "/usr/lib/python3.9/mimetypes.py", line 326, in guess_extension
return _db.guess_extension(type, strict)
File "/usr/lib/python3.9/mimetypes.py", line 192, in guess_extension
extensions = self.guess_all_extensions(type, strict)
File "/usr/lib/python3.9/mimetypes.py", line 171, in guess_all_extensions
type = type.lower()
AttributeError: 'NoneType' object has no attribute 'lower'
```
I dont think it's my code. If you want it, ask me. Thanks in advance !
</pre>
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<a href="https://github.com/python/cpython/issues/96264">View on GitHub</a>
<p>Labels: type-bug</p>
<p>Assignee: </p>