diff --git a/packages/web/src/components/ChooseAppAndEventSubstep/index.jsx b/packages/web/src/components/ChooseAppAndEventSubstep/index.jsx
index 54d9ad34..64d1eabc 100644
--- a/packages/web/src/components/ChooseAppAndEventSubstep/index.jsx
+++ b/packages/web/src/components/ChooseAppAndEventSubstep/index.jsx
@@ -102,6 +102,7 @@ function ChooseAppAndEventSubstep(props) {
               ...step,
               key: eventKey,
               keyLabel: eventLabel,
+              parameters: {},
             },
           });
         }