diff --git a/nbdev/_modidx.py b/nbdev/_modidx.py
index 866d19dba..2d86c634b 100644
--- a/nbdev/_modidx.py
+++ b/nbdev/_modidx.py
@@ -56,7 +56,7 @@
                 'title': 'nbdev',
                 'tst_flags': 'notest',
                 'user': 'fastai',
-                'version': '2.1.0'},
+                'version': '2.1.1'},
   'syms': { 'nbdev.clean': { 'nbdev.clean.clean_jupyter': 'https://nbdev.fast.ai/clean.html#clean_jupyter',
                              'nbdev.clean.clean_nb': 'https://nbdev.fast.ai/clean.html#clean_nb',
                              'nbdev.clean.nbdev_clean': 'https://nbdev.fast.ai/clean.html#nbdev_clean',
diff --git a/nbdev/doclinks.py b/nbdev/doclinks.py
index bfec19271..f9f6f3f16 100644
--- a/nbdev/doclinks.py
+++ b/nbdev/doclinks.py
@@ -124,7 +124,7 @@ def build_modidx():
 def nbglob(path=None, skip_folder_re = '^[_.]', file_glob='*.ipynb', recursive=True, key='nbs_path',
            as_path=False, **kwargs):
     "Find all files in a directory matching an extension given a `config_key`."
-    path = Path(path or config_key(key))
+    path = Path(path or config_key(key, '.', missing_ok=True))
     if recursive is None: recursive=get_config().get('recursive', 'False').lower() == 'true'
     res = globtastic(path, file_glob=file_glob, skip_folder_re=skip_folder_re, **kwargs)
     return res.map(Path) if as_path else res
diff --git a/nbs/04b_doclinks.ipynb b/nbs/04b_doclinks.ipynb
index 7b3095766..745de6cea 100644
--- a/nbs/04b_doclinks.ipynb
+++ b/nbs/04b_doclinks.ipynb
@@ -415,7 +415,7 @@
     "def nbglob(path=None, skip_folder_re = '^[_.]', file_glob='*.ipynb', recursive=True, key='nbs_path',\n",
     "           as_path=False, **kwargs):\n",
     "    \"Find all files in a directory matching an extension given a `config_key`.\"\n",
-    "    path = Path(path or config_key(key))\n",
+    "    path = Path(path or config_key(key, '.', missing_ok=True))\n",
     "    if recursive is None: recursive=get_config().get('recursive', 'False').lower() == 'true'\n",
     "    res = globtastic(path, file_glob=file_glob, skip_folder_re=skip_folder_re, **kwargs)\n",
     "    return res.map(Path) if as_path else res"