--- a/testing/talos/talos/heavy.py
+++ b/testing/talos/talos/heavy.py
@@ -52,18 +52,20 @@ def follow_redirects(url, max=3):
     current = 0
     page = requests.head(url)
     while page.status_code == 303 and current < max:
         current += 1
         location = page.headers['Location']
         page = requests.head(location)
     if page.status_code == 303 and current == max:
         raise ValueError("Max redirects Reached")
-    last_modified = page.headers['Last-Modified']
-    last_modified = datetime.datetime(*parsedate(last_modified)[:6])
+
+    last_modified = page.headers.get('Last-Modified', None)
+    if last_modified is not None:
+        last_modified = datetime.datetime(*parsedate(last_modified)[:6])
     return location, last_modified
 
 
 def _recursive_mtime(path):
     max = os.path.getmtime(path)
     for root, dirs, files in os.walk(path):
         for element in dirs + files:
             age = os.path.getmtime(os.path.join(root, element))