undefined -> null, you can spread null aparently

frontend/src/metabase/query_builder/components/view/sidebars/ChartSettingsSidebar.jsx

@@ -6,7 +6,7 @@ import visualizations from "metabase/visualizations";
 import SidebarContent from "metabase/query_builder/components/SidebarContent";
 
 export default class ChartSettingsSidebar extends React.Component {
-  state = { sidebarPropsOverride: undefined };
+  state = { sidebarPropsOverride: null };
 
   setSidebarPropsOverride = sidebarPropsOverride =>
     this.setState({ sidebarPropsOverride });
@@ -29,7 +29,7 @@ export default class ChartSettingsSidebar extends React.Component {
           title={t`${visualizations.get(question.display()).uiName} options`}
           onDone={onClose}
           onBack={onOpenChartType}
-          {...sidebarPropsOverride || {}}
+          {...sidebarPropsOverride}
         >
           <ChartSettings
             question={question}

frontend/src/metabase/visualizations/components/settings/ChartNestedSettingColumns.jsx

@@ -53,7 +53,7 @@ class ColumnWidgets extends React.Component {
   componentWillUnmount() {
     const { setSidebarPropsOverride } = this.props;
     if (setSidebarPropsOverride) {
-      setSidebarPropsOverride(undefined);
+      setSidebarPropsOverride(null);
     }
   }