diff --git a/superset-frontend/plugins/plugin-chart-handlebars/src/plugin/controls/handlebarTemplate.tsx b/superset-frontend/plugins/plugin-chart-handlebars/src/plugin/controls/handlebarTemplate.tsx
index c43d95487..6f21892e0 100644
--- a/superset-frontend/plugins/plugin-chart-handlebars/src/plugin/controls/handlebarTemplate.tsx
+++ b/superset-frontend/plugins/plugin-chart-handlebars/src/plugin/controls/handlebarTemplate.tsx
@@ -101,6 +101,7 @@ export const handlebarsTemplateControlSetItem: ControlSetItem = {
 </ul>`,
     isInt: false,
     renderTrigger: true,
+    valueKey: null,
 
     validators: [validateNonEmpty],
     mapStateToProps: ({ controls }) => ({
diff --git a/superset-frontend/plugins/plugin-chart-handlebars/src/plugin/controls/style.tsx b/superset-frontend/plugins/plugin-chart-handlebars/src/plugin/controls/style.tsx
index b5f8dc938..972322814 100644
--- a/superset-frontend/plugins/plugin-chart-handlebars/src/plugin/controls/style.tsx
+++ b/superset-frontend/plugins/plugin-chart-handlebars/src/plugin/controls/style.tsx
@@ -75,6 +75,7 @@ export const styleControlSetItem: ControlSetItem = {
     description: t('CSS applied to the chart'),
     isInt: false,
     renderTrigger: true,
+    valueKey: null,
 
     validators: [],
     mapStateToProps: ({ controls }) => ({