diff --git a/backend/src/api/websocket-handler.ts b/backend/src/api/websocket-handler.ts
index 0e5adacb6..c2897f38b 100644
--- a/backend/src/api/websocket-handler.ts
+++ b/backend/src/api/websocket-handler.ts
@@ -463,7 +463,9 @@ class WebsocketHandler {
       }
     }
 
-    await mempool.$saveTxFirstSeenTimes(transactions, _memPool);
+    if (config.MEMPOOL.TRANSACTION_INDEXING) {
+      await mempool.$saveTxFirstSeenTimes(transactions, _memPool);
+    }
 
     const removed: string[] = [];
     // Update mempool to remove transactions included in the new block