diff --git a/src/wireviz/wireviz.py b/src/wireviz/wireviz.py
index 16fcf5b..b33c9b5 100755
--- a/src/wireviz/wireviz.py
+++ b/src/wireviz/wireviz.py
@@ -424,7 +424,7 @@ def _get_yaml_data_and_path(inp: Union[str, Path, Dict]) -> Tuple[Dict, Path]:
             # (in Windows, it seems OSError [errno.EINVAL] might be raised in some cases)
             # when trying to expand and resolve it as a path.
             # Catch this error, but raise any others
-            if type(e) is OSError and e.errno not in (EINVAL, ENAMETOOLONG):
+            if type(e) is OSError and e.errno not in (EINVAL, ENAMETOOLONG, None):
                 raise e
             # file does not exist; assume inp is a YAML string
             yaml_str = inp