diff --git a/app/event/models.py b/app/event/models.py
index 6036a16..b39b92d 100644
--- a/app/event/models.py
+++ b/app/event/models.py
@@ -40,7 +40,7 @@ class Event(models.Model):
             if 'youtube.com/watch' in url:
                 url = url.replace('/watch?v=', '/embed/')
             elif 'twitter.com/' in url:
-                url = ur.replace('twitter.com', 'nitter.net')
+                url = url.replace('twitter.com', 'nitter.net')
             html += '<iframe src="%s" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>' % url
         if self.media_caption:
             html = '<figure>%s<figcaption>%s</figcaption></figure>' % (html, self.media_caption)