From 583a1820d616d2801f2701ac92d623e777534c1b Mon Sep 17 00:00:00 2001
From: Thijs Louisse <Thijs.Louisse@ing.com>
Date: Thu, 20 Feb 2020 11:24:03 +0100
Subject: [PATCH] fix: by default, serialize undefined values as ''

---
 packages/field/src/FormatMixin.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/packages/field/src/FormatMixin.js b/packages/field/src/FormatMixin.js
index 79b0b4758..b5c17cfef 100644
--- a/packages/field/src/FormatMixin.js
+++ b/packages/field/src/FormatMixin.js
@@ -164,7 +164,7 @@ export const FormatMixin = dedupeMixin(
        * @returns {String} serializedValue
        */
       serializer(v) {
-        return v;
+        return v !== undefined ? v : '';
       }
 
       /**
@@ -175,7 +175,7 @@ export const FormatMixin = dedupeMixin(
        * @returns {Object} modelValue
        */
       deserializer(v) {
-        return v;
+        return v === undefined ? '' : v;
       }
 
       /**