diff --git a/page.py b/page.py
index 949d192..f4d5e29 100755
--- a/page.py
+++ b/page.py
@@ -24,7 +24,7 @@ def blog_page_template():
 def date_from_filename(filename):
 	return maybe(
 		re.search(r"(?:^|/)([0-9]{4}-[0-9]{2}-[0-9]{2})[^/]+$", filename)
-	).group(1).or_none()
+	).group(1).or_else(None)
 
 
 def blog_page_metadata(filename):
diff --git a/rss.py b/rss.py
index 5c1cd76..a0c204f 100755
--- a/rss.py
+++ b/rss.py
@@ -33,6 +33,8 @@ ITEM_TEMPLATE = """
 
 def iso8601_to_rfc822(iso8601):
 	# pylint: disable=invalid-name
+	if not iso8601:
+		return ""
 	y, m, d = map(int, iso8601.split("-"))
 	month = ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"][m]
 	return f"{d} {month} {y} 00:00:00 UTC"