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Explorer menu invisible with out of index error

See original GitHub issue

Internal Server Error: /admin/explorer-nav/
Traceback (most recent call last):
  File "/var/www/vhosts/example.com/django-app/django-app-venv/local/lib/python2.7/site-packages/django/core/handlers/base.py", line 149, in get_response
    response = self.process_exception_by_middleware(e, request)
  File "/var/www/vhosts/example.com/django-app/django-app-venv/local/lib/python2.7/site-packages/django/core/handlers/base.py", line 147, in get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/var/www/vhosts/example.com/django-app/django-app-venv/local/lib/python2.7/site-packages/django/views/decorators/cache.py", line 43, in _cache_controlled
    response = viewfunc(request, *args, **kw)
  File "/var/www/vhosts/example.com/django-app/django-app-venv/local/lib/python2.7/site-packages/wagtail/wagtailadmin/decorators.py", line 22, in decorated_view
    return view_func(request, *args, **kwargs)
  File "/var/www/vhosts/example.com/django-app/django-app-venv/local/lib/python2.7/site-packages/wagtail/wagtailadmin/views/pages.py", line 27, in explorer_nav
    'nodes': get_navigation_menu_items(),
  File "/var/www/vhosts/example.com/django-app/django-app-venv/local/lib/python2.7/site-packages/wagtail/wagtailcore/models.py", line 1378, in get_navigation_menu_items
    parent_page, parent_childlist = depth_list[page.depth - 1]
IndexError: list index out of range