diff --git a/packages/relay/src/lib/clients/mirrorNodeClient.ts b/packages/relay/src/lib/clients/mirrorNodeClient.ts
index 997ba76891..bb0990ae8d 100644
--- a/packages/relay/src/lib/clients/mirrorNodeClient.ts
+++ b/packages/relay/src/lib/clients/mirrorNodeClient.ts
@@ -1,8 +1,8 @@
-/* -
+/*-
  *
  * Hedera JSON RPC Relay
  *
- * Copyright (C) 2022-2024 Hedera Hashgraph, LLC
+ * Copyright (C) 2024 Hedera Hashgraph, LLC
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -620,7 +620,10 @@ export class MirrorNodeClient {
       requestDetails,
     );
 
-    await this.cacheService.set(cachedLabel, block, MirrorNodeClient.GET_BLOCK_ENDPOINT, requestDetails);
+    if (block) {
+      await this.cacheService.set(cachedLabel, block, MirrorNodeClient.GET_BLOCK_ENDPOINT, requestDetails);
+    }
+
     return block;
   }
 
diff --git a/packages/relay/src/receiptsRootUtils.ts b/packages/relay/src/receiptsRootUtils.ts
index c9603de699..727eef4ba8 100644
--- a/packages/relay/src/receiptsRootUtils.ts
+++ b/packages/relay/src/receiptsRootUtils.ts
@@ -21,8 +21,9 @@
 import { RLP } from '@ethereumjs/rlp';
 import { Trie } from '@ethereumjs/trie';
 import { bytesToInt, concatBytes, hexToBytes, intToBytes, intToHex } from '@ethereumjs/util';
-import { EthImpl } from './lib/eth';
+
 import { prepend0x } from './formatters';
+import { EthImpl } from './lib/eth';
 import { Log } from './lib/model';
 import { LogsBloomUtils } from './logsBloomUtils';
 
@@ -93,16 +94,25 @@ export class ReceiptsRootUtils {
   public static buildReceiptRootHashes(txHashes: string[], contractResults: any[], logs: Log[]): IReceiptRootHash[] {
     const receipts: IReceiptRootHash[] = [];
 
-    for (let i in txHashes) {
+    for (const i in txHashes) {
       const txHash: string = txHashes[i];
       const logsPerTx: Log[] = logs.filter((log) => log.transactionHash == txHash);
       const crPerTx: any[] = contractResults.filter((cr) => cr.hash == txHash);
+
+      let transactionIndex: any = null;
+      if (crPerTx.length && crPerTx[0].transaction_index != null) {
+        transactionIndex = intToHex(crPerTx[0].transaction_index);
+      } else if (logsPerTx.length) {
+        transactionIndex = logsPerTx[0].transactionIndex;
+      }
+
       receipts.push({
-        transactionIndex: crPerTx.length ? intToHex(crPerTx[0].transaction_index) : logsPerTx[0].transactionIndex,
+        transactionIndex,
         type: crPerTx.length && crPerTx[0].type ? intToHex(crPerTx[0].type) : null,
         root: crPerTx.length ? crPerTx[0].root : EthImpl.zeroHex32Byte,
         status: crPerTx.length ? crPerTx[0].status : EthImpl.oneHex,
-        cumulativeGasUsed: crPerTx.length ? intToHex(crPerTx[0].block_gas_used) : EthImpl.zeroHex,
+        cumulativeGasUsed:
+          crPerTx.length && crPerTx[0].block_gas_used ? intToHex(crPerTx[0].block_gas_used) : EthImpl.zeroHex,
         logsBloom: crPerTx.length
           ? crPerTx[0].bloom
           : LogsBloomUtils.buildLogsBloom(logs[0].address, logsPerTx[0].topics),