diff --git a/app/item/models.py b/app/item/models.py
index 1709e1a..d0419c7 100644
--- a/app/item/models.py
+++ b/app/item/models.py
@@ -336,5 +336,6 @@ class Week(models.Model):
                         colors.append(f'hsl({color}, 50%, 15%, 0.8)')
             if len(colors) == 1:
                 colors.append(colors[0].replace('80%', '50%'))
-            return 'linear-gradient(to bottom, %s)' % ', '.join(colors)
+            if colors:
+                return 'linear-gradient(to bottom, %s)' % ', '.join(colors)
         return ''
diff --git a/app/listmonk/utils.py b/app/listmonk/utils.py
index 657c04d..cb770e6 100644
--- a/app/listmonk/utils.py
+++ b/app/listmonk/utils.py
@@ -23,7 +23,7 @@ def get_auth(headers):
 
 def send_week(monday):
     from . import views
-    date = datetime.strptime(date, '%Y-%m-%d')
+    date = datetime.strptime(monday, '%Y-%m-%d')
     monday = views.get_monday(date)
     year, month, day = monday.split('-')
     body = views.week(year, month, day)