Fix being unable to parse block where a tx inner transactions are null

packages/node/CHANGELOG.md

@@ -5,6 +5,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+### Fixed
+- Parsing transactions where innerTransactions is null (#23)
 
 ## [6.1.1] - 2025-09-10
 ### Added

packages/node/src/solana/api.solana.spec.ts

@@ -21,7 +21,9 @@ import {
 
 // Add api key to work
 const HTTP_ENDPOINT =
-  process.env.HTTP_ENDPOINT ?? 'https://solana.api.onfinality.io/public';
+  process.env.HTTP_ENDPOINT ??
+  'https://api.mainnet-beta.solana.com' ??
+  'https://solana.api.onfinality.io/public';
 
 const IDL_swap: IdlV01 = require('../../test/swapFpHZwjELNnjvThjajtiVmkz3yPQEHjLtka2fwHW.idl.json');
 
@@ -37,8 +39,11 @@ describe('Api.solana', () => {
     block = await solanaApi.fetchBlock(325_922_873);
   }, 20_000);
 
-  function getTxBySig(sig: string): SolanaTransaction {
-    const tx = block.block.transactions.find((tx) =>
+  function getTxBySig(
+    sig: string,
+    specificBlock?: IBlock<SolanaBlock>,
+  ): SolanaTransaction {
+    const tx = (specificBlock ?? block).block.transactions.find((tx) =>
       tx.transaction.signatures.find((s) => s === sig),
     );
     if (!tx) {
@@ -261,6 +266,26 @@ describe('Api.solana', () => {
       expect(txWError!.meta!.logs).toBeDefined();
       expect(txWError!.meta!.logs!.length).toBeGreaterThan(0);
     });
+
+    it('can parse a block with a transaction that has "null" innerTransactions', async () => {
+      // The problem transaction: https://solscan.io/tx/3mSAfK9hm4wgMw5kzKpVz73viBftapNLwECN9rmG5Q6qWPyARognZsyoosB4XjYf5nFRtcEmrKGVgLGLRN7tnmWN?cluster=devnet
+      const solanaApi = await SolanaApi.create(
+        'https://api.devnet.solana.com',
+        eventEmitter,
+        decoder,
+      );
+
+      const block = await solanaApi.fetchBlock(405433240);
+
+      expect(block).toBeDefined();
+
+      expect(
+        getTxBySig(
+          '3mSAfK9hm4wgMw5kzKpVz73viBftapNLwECN9rmG5Q6qWPyARognZsyoosB4XjYf5nFRtcEmrKGVgLGLRN7tnmWN',
+          block,
+        ),
+      ).toBeDefined();
+    });
   });
 
   // Tests that data types can be stringified, this is important to test because of circular references

packages/node/src/solana/api.solana.ts

@@ -137,7 +137,7 @@ export class SolanaApi {
         return 'mainnet';
       case 'EKLxEB4xoEDq9AAn5HhFiP5WqdhNVc4An2HvJyzHzx7u': // Not tested
         return 'testnet;';
-      case 'GH7ome3EiwEr7tu9JuTh2dpYWBJK3z69Xm1ZE3MEE6JC':
+      case 'EtWTRABZaYq6iMfeYKouRu166VU2xqa1wcaWoxPkrZBG':
         return 'devnet';
       default:
         return 'unknown';

packages/node/src/solana/block.solana.ts

@@ -231,7 +231,7 @@ export function transformBlock(
           meta: tx.meta
             ? {
                 ...tx.meta,
-                innerInstructions: tx.meta.innerInstructions.map(
+                innerInstructions: (tx.meta.innerInstructions ?? []).map(
                   (innerInstruction) => ({
                     ...innerInstruction,
                     instructions: innerInstruction.instructions.map(