diff --git a/src/super-tag/type.d.ts b/src/super-tag/type.d.ts
index 814363f..3c10c6d 100644
--- a/src/super-tag/type.d.ts
+++ b/src/super-tag/type.d.ts
@@ -10,6 +10,7 @@ declare module '$:/plugins/linonetwo/super-tag/utils/initEditor.js' {
 
 declare module '@json-editor/json-editor' {
   // copy from https://github.com/DefinitelyTyped/DefinitelyTyped/blob/master/types/json-editor/index.d.ts
+  // add `hideAddProperty`
 
   interface JSONEditorOptions<TValue> {
     /**
@@ -163,6 +164,12 @@ declare module '@json-editor/json-editor' {
       resolvers: Array<(schema: any) => string>;
     };
 
+    editors: {
+      SuperTag: {
+        hideAddProperty(): void;
+      }
+    }
+
     public static plugins: {
       ace: {
         theme: string;
diff --git a/src/super-tag/widgets/utils/formOnChange.ts b/src/super-tag/widgets/utils/formOnChange.ts
index f994f05..ab2b90e 100644
--- a/src/super-tag/widgets/utils/formOnChange.ts
+++ b/src/super-tag/widgets/utils/formOnChange.ts
@@ -26,6 +26,11 @@ export function formOnChange(currentTiddlerTitle?: string, editor?: JSONEditor.J
         tiddlerFields = tiddlerFieldsWithoutKey;
         delete latestFormValue[key];
       }
+      // if it was empty, and user add a new property, close the dialog
+      if (tiddlerFields[key] === undefined && key in latestFormValue) {
+        // based on `form_name_root`
+        editor.editors.SuperTag.hideAddProperty();
+      }
     }
   });
   if (hasChange) {