diff --git a/sdk/src/client/bindings/nodejs/test/client/offlineSigningExamples.spec.ts b/sdk/src/client/bindings/nodejs/test/client/offlineSigningExamples.spec.ts
index cf13c220ad..d63f58575d 100644
--- a/sdk/src/client/bindings/nodejs/test/client/offlineSigningExamples.spec.ts
+++ b/sdk/src/client/bindings/nodejs/test/client/offlineSigningExamples.spec.ts
@@ -95,10 +95,14 @@ describe('Offline signing examples', () => {
             preparedTx.essence,
         );
 
+        if (preparedTx.inputsData[0].chain === undefined) {
+            throw 'chain is undefined';
+        }
+
         const unlock = await offlineClient.signatureUnlock(
             secretManager,
             hexToBytes(txEssenceHash),
-            preparedTx.inputsData[0].chain!,
+            preparedTx.inputsData[0].chain,
         );
 
         expect(unlock).toStrictEqual({