Pylint crashes on disable=invalid-name on NewTypes

[quodlibetor]

, ### Steps to reproduce
I can't actually reproduce this without my exact code, but the structure looks like:

from typing import Dict, NamedTuple, NewType, Set

UserId = NewType('UserId', str)  # pylint: disable=invalid-name
PlaceId = NewType('PlaceId', str)  # pylint: disable=invalid-name


class Bar(NamedTuple):
    place: PlaceId
    name: str


class Foo(NamedTuple):
    user: Dict[UserId, Set[Bar]]

without the disable=invalid-name this succeeds fine, but with it I get:

Traceback (most recent call last):
  File "$project"/bin/pylint", line 11, in <module>
    sys.exit(run_pylint())
  File "$project"/lib/python3.6/site-packages/pylint/__init__.py", line 13, in run_pylint
    Run(sys.argv[1:])
  File "$project"/lib/python3.6/site-packages/pylint/lint.py", line 1300, in __init__
    linter.check(args)
  File "$project"/lib/python3.6/site-packages/pylint/lint.py", line 726, in check
    self._do_check(files_or_modules)
  File "$project"/lib/python3.6/site-packages/pylint/lint.py", line 855, in _do_check
    self.check_astroid_module(ast_node, walker, rawcheckers, tokencheckers)
  File "$project"/lib/python3.6/site-packages/pylint/lint.py", line 934, in check_astroid_module
    walker.walk(ast_node)
  File "$project"/lib/python3.6/site-packages/pylint/utils.py", line 973, in walk
    self.walk(child)
  File "$project"/lib/python3.6/site-packages/pylint/utils.py", line 970, in walk
    cb(astroid)
  File "$project"/lib/python3.6/site-packages/pylint/checkers/classes.py", line 536, in visit_classdef
    self._check_bases_classes(node)
  File "$project"/lib/python3.6/site-packages/pylint/checkers/classes.py", line 1125, in _check_bases_classes
    unimplemented_abstract_methods(node, is_abstract).items(),
  File "$project"/lib/python3.6/site-packages/pylint/checkers/utils.py", line 552, in unimplemented_abstract_methods
    infered = safe_infer(obj)
  File "$project"/lib/python3.6/site-packages/pylint/checkers/utils.py", line 773, in safe_infer
    value = next(inferit)
  File "$project"/lib/python3.6/site-packages/astroid/decorators.py", line 85, in wrapped
    res = next(generator)
  File "$project"/lib/python3.6/site-packages/astroid/bases.py", line 93, in _infer_stmts
    context.lookupname = stmt._infer_name(frame, name)
AttributeError: 'NoneType' object has no attribute '_infer_name'

Current behavior

Expected behavior

pylint --version output

pylint is an unmodified version of d78e013 , astroid is 313c0c3 , python is:
Python 3.6.0 (default, Mar 1 2017, 17:08:51)
[GCC 4.2.1 Compatible Apple LLVM 8.0.0 (clang-800.0.42.1)]