'NoneType' object has no attribute 'walk'

[danwos]

I get the following error if I try to use sphinx-immaterial with a fresh sphinx project, created by sphinx-quickstart.

Extension error (sphinx_immaterial.nav_adapt):
Handler <function _html_page_context at 0x7f47a41e1c60> for event 'html-page-context' threw an exception (exception: 'NoneType' object has no attribute 'walk')

The reason is, that you need a toctree directive and at least one additional rst-file, which must be mentioned in the toctree directive.

So this does not work (index.rst):

Project
=======
Test me

This does also not work:

Project
=======
Test me

.. toctree::

but this works:

Project
=======
Test me

.. toctree::

   page.rst

The problematic code is inside nav_adapt.py:

def _get_mkdocs_toc(
    toc_node: docutils.nodes.Node, builder: sphinx.builders.Builder
) -> List[MkdocsNavEntry]:
    """Converts a docutils toc node into a mkdocs-format JSON toc."""
    visitor = _TocVisitor(sphinx.util.docutils.new_document(""), builder)
    toc_node.walk(visitor)
    return visitor._children

and there toc_node can be None for small documentation projects.

[danwos]

Added really small PR to fix this issue: #52

[2bndy5]

Could this be related to #41 ?

[jbms]

Thanks -- I merged your PR.

I don't think it is related to #41.