diff --git a/assets/js/src/form_editor/blocks/map_custom_field_form_data.jsx b/assets/js/src/form_editor/blocks/map_custom_field_form_data.jsx
index 18879dda68..eefad8f594 100644
--- a/assets/js/src/form_editor/blocks/map_custom_field_form_data.jsx
+++ b/assets/js/src/form_editor/blocks/map_custom_field_form_data.jsx
@@ -2,23 +2,23 @@ function mapFormDataToParams(fieldType, data) {
   switch (fieldType) {
     case 'checkbox':
       return {
-        required: data.mandatory ? '1' : undefined,
+        required: data.mandatory ? '1' : '',
         values: [{
-          is_checked: data.isChecked ? '1' : undefined,
+          is_checked: data.isChecked ? '1' : '',
           value: data.checkboxLabel,
         }],
       };
     case 'date':
       return {
-        required: data.mandatory ? '1' : undefined,
+        required: data.mandatory ? '1' : '',
         date_type: data.dateType,
         date_format: data.dateFormat,
-        is_default_today: data.defaultToday ? '1' : undefined,
+        is_default_today: data.defaultToday ? '1' : '',
       };
     case 'radio':
     case 'select':
       return {
-        required: data.mandatory ? '1' : undefined,
+        required: data.mandatory ? '1' : '',
         values: data.values.map((value) => {
           const mapped = { value: value.name };
           if (value.isChecked) {
@@ -29,12 +29,12 @@ function mapFormDataToParams(fieldType, data) {
       };
     case 'text':
       return {
-        required: data.mandatory ? '1' : undefined,
+        required: data.mandatory ? '1' : '',
         validate: data.validate,
       };
     case 'textarea':
       return {
-        required: data.mandatory ? '1' : undefined,
+        required: data.mandatory ? '1' : '',
         validate: data.validate,
         lines: data.lines ? data.lines : '1',
       };