Use optional chain

packages/app/src/server/service/page.ts

@@ -262,7 +262,7 @@ class PageService {
       authority: IPageDeleteConfigValueToProcessValidation | null,
       recursiveAuthority: IPageDeleteConfigValueToProcessValidation | null,
   ): boolean {
-    const isAdmin = operator.admin;
+    const isAdmin = operator?.admin ?? false;
     const isOperator = operator?._id == null ? false : operator._id.equals(creatorId);
 
     if (isRecursively) {