diff --git a/ngl/client.py b/ngl/client.py
index 94afad2..6c052f1 100644
--- a/ngl/client.py
+++ b/ngl/client.py
@@ -93,6 +93,7 @@ def _parse_date(date_str: tp.Optional[str]):
         if not date_str:
             return None
         check_date_formats = (r"%d %b, %Y", r"%b %d, %Y", r"%b %Y")
+        e = None
         for fmt in check_date_formats:
             try:
                 return datetime.strptime(date_str, fmt).date()