Update app.py

app.py

@@ -53,7 +53,7 @@ def main():
     
     preferences = get_user_preferences()
     
-    if preferences["username"]:
+    if "username" in preferences and preferences["username"]:
         loaded_preferences = load_user_preferences(preferences["username"])
         if loaded_preferences:
             preferences.update(loaded_preferences)
@@ -66,7 +66,8 @@ def main():
     user_data = preprocess_user_preferences(preferences)
     prediction = model.predict(user_data)
 
-    st.write("## AI-driven Personalized Content")    
+    st.write("## AI-driven Personalized Content")
+
     
     st.markdown("### Recommendation Score")
     st.write(f"{prediction[0][0] * 100:.2f}%")