AttributeError: 'NoneType' object has no attribute 'endswith' #162

Traceback (most recent call last):
File "", line 1, in
File "", line 1, in to_javascript
File "python_to_pythonjs.py", line 3801, in main
module_path = module_path
File "python_to_pythonjs.py", line 259, in init
self.visit(node)
File "python_to_pythonjs.py", line 267, in visit
res = visitor(node)
File "python_to_pythonjs.py", line 406, in visit_ImportFrom
path = os.path.join( self._module_path, node.module+'.py')
File "/lib/python2.7/posixpath.py", line 68, in join
elif path == '' or path.endswith('/'):
AttributeError: 'NoneType' object has no attribute 'endswith'