Thanks for the report.  Retitling because this has nothing to do with map:

>>> def foo(*args):
...     raise TypeError('fake')
...     yield 1
... 
>>> foo(1, *foo())
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: foo() argument after * must be an iterable, not generator
>>> foo(*foo())
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<stdin>", line 2, in foo
TypeError: fake