[bug] coerce potention undefined to null as return value of getObject()

src/services/database.service.ts

@@ -364,7 +364,7 @@ export class Database {
       getRequest.onsuccess = () => resolve(getRequest.result);
       getRequest.onerror = () => reject(getRequest.error);
     });
-    return result;
+    return result ?? null; // Convert undefined to null
   }
 
   public async dumpStore(storeName: string): Promise<Record<string, any>> {