diff --git a/packages/designer/src/designer/setting/setting-entry.ts b/packages/designer/src/designer/setting/setting-entry.ts
index 8a81b5629..6db545c70 100644
--- a/packages/designer/src/designer/setting/setting-entry.ts
+++ b/packages/designer/src/designer/setting/setting-entry.ts
@@ -13,5 +13,5 @@ export interface SettingEntry extends SettingTarget {
   // 父级
   readonly parent: SettingEntry;
 
-  get(propName: string | number): SettingEntry;
+  get(propName: string | number): SettingEntry | null;
 }
diff --git a/packages/designer/src/designer/setting/setting-top-entry.ts b/packages/designer/src/designer/setting/setting-top-entry.ts
index 1439e464a..ff65ad4b3 100644
--- a/packages/designer/src/designer/setting/setting-top-entry.ts
+++ b/packages/designer/src/designer/setting/setting-top-entry.ts
@@ -150,7 +150,8 @@ export class SettingTopEntry implements SettingEntry {
   /**
    * 获取子项
    */
-  get(propName: string | number): SettingPropEntry {
+  get(propName: string | number): SettingPropEntry | null {
+    if (!propName) return null;
     return this._settingFieldMap[propName] || (new SettingPropEntry(this, propName));
   }
 
diff --git a/packages/types/src/setting-target.ts b/packages/types/src/setting-target.ts
index 6f686e069..571ea8022 100644
--- a/packages/types/src/setting-target.ts
+++ b/packages/types/src/setting-target.ts
@@ -42,7 +42,7 @@ export interface SettingTarget {
   setValue(value: any): void;
 
   // 取得子项
-  get(propName: string | number): SettingTarget;
+  get(propName: string | number): SettingTarget | null;
 
   // 获取子项属性值
   getPropValue(propName: string | number): any;