diff --git a/section4/app.py b/section4/app.py
index 22bcdfa1..69ed7ed1 100644
--- a/section4/app.py
+++ b/section4/app.py
@@ -5,6 +5,7 @@
 from security import authenticate, identity
 
 app = Flask(__name__)
+app.config['PROPAGATE_EXCEPTIONS'] = True # To allow flask propagating exception even if debug is set to false on app
 app.secret_key = 'jose'
 api = Api(app)