diff --git a/static/declaration-data.js b/static/declaration-data.js
index 28a06a9..88dc85c 100644
--- a/static/declaration-data.js
+++ b/static/declaration-data.js
@@ -272,7 +272,7 @@ async function fetchCachedDeclarationData() {
   return new Promise((resolve, reject) => {
     let transactionRequest = store.get(CACHE_DB_KEY);
     transactionRequest.onsuccess = function (event) {
-      resolve(event.result);
+      resolve(event.target.result);
     };
     transactionRequest.onerror = function (event) {
       reject(new Error(`fail to store declaration data`));