diff --git a/docs/src/pages/components/data-grid/editing/StartEditButtonGrid.js b/docs/src/pages/components/data-grid/editing/StartEditButtonGrid.js
index f54ee71bea3a..e12bab09f207 100644
--- a/docs/src/pages/components/data-grid/editing/StartEditButtonGrid.js
+++ b/docs/src/pages/components/data-grid/editing/StartEditButtonGrid.js
@@ -66,7 +66,7 @@ EditToolbar.propTypes = {
   apiRef: PropTypes.shape({
     current: PropTypes.object.isRequired,
   }).isRequired,
-  selectedCellParams: PropTypes.any.isRequired,
+  selectedCellParams: PropTypes.any,
   setSelectedCellParams: PropTypes.func.isRequired,
 };
 
diff --git a/docs/src/pages/components/data-grid/editing/StartEditButtonGrid.tsx b/docs/src/pages/components/data-grid/editing/StartEditButtonGrid.tsx
index c5ea35dca860..2441aed7ed71 100644
--- a/docs/src/pages/components/data-grid/editing/StartEditButtonGrid.tsx
+++ b/docs/src/pages/components/data-grid/editing/StartEditButtonGrid.tsx
@@ -31,8 +31,8 @@ const useStyles = makeStyles(
 
 interface EditToolbarProps {
   apiRef: GridApiRef;
+  selectedCellParams?: any;
   setSelectedCellParams: (value: any) => void;
-  selectedCellParams: any;
 }
 
 function EditToolbar(props: EditToolbarProps) {