diff --git a/external/systemjs/plugin-babel-cached.js b/external/systemjs/plugin-babel-cached.js
index 3fca8af3d..0d21d6b75 100644
--- a/external/systemjs/plugin-babel-cached.js
+++ b/external/systemjs/plugin-babel-cached.js
@@ -55,6 +55,9 @@ function storeCache(address, hashCode, translated, format) {
       tx.oncomplete = function () {
         resolve();
       };
+      tx.onerror = function () {
+        resolve();
+      };
     });
   });
 }
@@ -74,6 +77,9 @@ function loadCache(address, hashCode) {
           format: found.format,
         } : null);
       };
+      tx.onerror = function () {
+        resolve(null);
+      };
     });
   });
 }