diff --git a/docs/dex-transaction.md b/docs/dex-transaction.md
index a9dc2fe..249b90e 100644
--- a/docs/dex-transaction.md
+++ b/docs/dex-transaction.md
@@ -9,8 +9,8 @@ This documentation provides details on how to interact with the **Stableswap** a
 - **Stableswap class**: Located in `src/stableswap.ts`.
 - **AMM V2 class**: Located in `src/dex-v2.ts`.
 - **Example file**: Demonstrates usage of both classes, located in `examples/example.ts`.
-- **DexV2Worker Class**: Located in `src/dex-v2-worker.ts`.
-- **DexV2Worker Example**: Located in `examples/dex-v2-worker-example.ts`.
+- **ExpiredOrderMonitor Class**: Located in `src/expired-order-monitor.ts`.
+- **ExpiredOrderMonitor Example**: Located in `examples/expired-order-monitor-example.ts`.
 
 ### Utility Functions
 
@@ -221,7 +221,7 @@ const txId = await signedTx.submit();
 console.info(`Transaction submitted successfully: ${txId}`);
 ```
 
-### 4. Run Dex V2 Worker
+### 4. Off-chain component to track and cancel the expired orders
 
 ```ts
 const network: Network = "Preprod";
@@ -244,13 +244,13 @@ const blockfrostAdapter = new BlockfrostAdapter(
   })
 );
 
-const worker = new DexV2Worker({
+const monitor = new ExpiredOrderMonitor({
   lucid,
   blockfrostAdapter,
   privateKey: "<YOUR_PRIVATE_KEY>",
 });
 
-await worker.start();
+await monitor.start();
 ```
 
 ## Additional Examples
diff --git a/examples/dex-v2-worker-example.ts b/examples/expired-order-monitor-example.ts
similarity index 87%
rename from examples/dex-v2-worker-example.ts
rename to examples/expired-order-monitor-example.ts
index f9ba0f6..3b85155 100644
--- a/examples/dex-v2-worker-example.ts
+++ b/examples/expired-order-monitor-example.ts
@@ -2,7 +2,7 @@ import { BlockFrostAPI } from "@blockfrost/blockfrost-js";
 import { Network } from "@minswap/lucid-cardano";
 
 import { BlockfrostAdapter, NetworkId } from "../src";
-import { DexV2Worker } from "../src/dex-v2-worker";
+import { ExpiredOrderMonitor } from "../src/expired-order-monitor";
 import { getBackendLucidInstance } from "../src/utils/lucid";
 
 async function main(): Promise<void> {
@@ -27,13 +27,13 @@ async function main(): Promise<void> {
     })
   );
 
-  const worker = new DexV2Worker({
+  const monitor = new ExpiredOrderMonitor({
     lucid,
     blockfrostAdapter,
     privateKey: "<YOUR_PRIVATE_KEY>",
   });
 
-  await worker.start();
+  await monitor.start();
 }
 
 void main();
diff --git a/src/dex-v2.ts b/src/dex-v2.ts
index 24c3735..a94f05c 100644
--- a/src/dex-v2.ts
+++ b/src/dex-v2.ts
@@ -1069,13 +1069,11 @@ export class DexV2 {
           break;
         }
         case OrderV2.ExtraDatumType.DATUM_HASH: {
-          invariant(
-            refundDatum.hash in extraDatumMap,
-            `Can not find refund datum of order ${orderUtxo.txHash}#${orderUtxo.outputIndex}`
-          );
           lucidTx.payToAddressWithData(
             datum.refundReceiver,
-            { asHash: extraDatumMap[refundDatum.hash] },
+            refundDatum.hash in extraDatumMap
+              ? { asHash: extraDatumMap[refundDatum.hash] }
+              : { hash: refundDatum.hash },
             outAssets
           );
           break;
diff --git a/src/dex-v2-worker.ts b/src/expired-order-monitor.ts
similarity index 93%
rename from src/dex-v2-worker.ts
rename to src/expired-order-monitor.ts
index 610922f..98ec277 100644
--- a/src/dex-v2-worker.ts
+++ b/src/expired-order-monitor.ts
@@ -9,7 +9,7 @@ type DexV2WorkerConstructor = {
   privateKey: string;
 };
 
-export class DexV2Worker {
+export class ExpiredOrderMonitor {
   private readonly lucid: Lucid;
   private readonly blockfrostAdapter: BlockfrostAdapter;
   private readonly privateKey: string;
@@ -66,7 +66,10 @@ export class DexV2Worker {
           mapDatum[receiverDatum.hash] = rawDatum;
           // eslint-disable-next-line unused-imports/no-unused-vars
         } catch (_err) {
-          continue;
+          if (receiverDatum.type === OrderV2.ExtraDatumType.INLINE_DATUM) {
+            // if receiver Datum type is INLINE_DATUM, skip this order.
+            continue;
+          }
         }
       }
       orders.push(order);