diff --git a/packages/indexer/src/data-indexing/service/Indexer.ts b/packages/indexer/src/data-indexing/service/Indexer.ts
index be2fd80..b638454 100644
--- a/packages/indexer/src/data-indexing/service/Indexer.ts
+++ b/packages/indexer/src/data-indexing/service/Indexer.ts
@@ -75,7 +75,7 @@ export class Indexer {
           notificationPath: "across-indexer-error",
           blockRangeResult,
           dataIdentifier: this.dataHandler.getDataIdentifier(),
-          error,
+          error: JSON.stringify(error),
         });
         blockRangeProcessedSuccessfully = false;
       } finally {