From c1f8ec90d804be765a4450313136ff803fe4006e Mon Sep 17 00:00:00 2001
From: toshi1127 <toshi.matsumoto.2n@stu.hosei.ac.jp>
Date: Tue, 12 Mar 2019 21:35:30 +0900
Subject: [PATCH] fix change value

---
 addons/knobs/src/components/PropForm.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/addons/knobs/src/components/PropForm.js b/addons/knobs/src/components/PropForm.js
index 5cdb4312bc9f..a477f502fbf8 100644
--- a/addons/knobs/src/components/PropForm.js
+++ b/addons/knobs/src/components/PropForm.js
@@ -10,7 +10,7 @@ export default class PropForm extends Component {
   makeChangeHandler(name, type) {
     const { onFieldChange } = this.props;
     return value => {
-      const change = { name, type, value };
+      const change = { name, type, value: value || '' };
 
       onFieldChange(change);
     };