diff --git a/typescript/cli/src/config/chain.ts b/typescript/cli/src/config/chain.ts
index ba804c666e..7a1f2509e8 100644
--- a/typescript/cli/src/config/chain.ts
+++ b/typescript/cli/src/config/chain.ts
@@ -1,5 +1,4 @@
 import { confirm, input, select } from '@inquirer/prompts';
-import fs from 'fs';
 
 import {
   ChainMap,
@@ -11,7 +10,12 @@ import { ProtocolType, objMerge } from '@hyperlane-xyz/utils';
 
 import { errorRed, log, logBlue, logGreen } from '../../logger.js';
 import { getMultiProvider } from '../context.js';
-import { FileFormat, mergeYamlOrJson, readYamlOrJson } from '../utils/files.js';
+import {
+  FileFormat,
+  isFile,
+  mergeYamlOrJson,
+  readYamlOrJson,
+} from '../utils/files.js';
 
 export function readChainConfigs(filePath: string) {
   log(`Reading file configs in ${filePath}`);
@@ -57,7 +61,7 @@ export function readChainConfigs(filePath: string) {
 }
 
 export function readChainConfigsIfExists(filePath: string) {
-  if (!fs.existsSync(filePath)) {
+  if (!isFile(filePath)) {
     log('No chain config file provided');
     return {};
   } else {
diff --git a/typescript/cli/src/deploy/warp.ts b/typescript/cli/src/deploy/warp.ts
index 317df98c06..d44b75e82b 100644
--- a/typescript/cli/src/deploy/warp.ts
+++ b/typescript/cli/src/deploy/warp.ts
@@ -28,6 +28,7 @@ import {
   getMergedContractAddresses,
 } from '../context.js';
 import {
+  isFile,
   prepNewArtifactsFiles,
   runFileSelectionStep,
   writeJson,
@@ -53,12 +54,14 @@ export async function runWarpDeploy({
 }) {
   const { multiProvider, signer } = getContextWithSigner(key, chainConfigPath);
 
-  if (!warpConfigPath) {
+  if (!warpConfigPath || !isFile(warpConfigPath)) {
     warpConfigPath = await runFileSelectionStep(
       './configs',
       'Warp config',
       'warp',
     );
+  } else {
+    log(`Using warp config at ${warpConfigPath}`);
   }
   const warpRouteConfig = readWarpRouteConfig(warpConfigPath);
 
@@ -115,11 +118,6 @@ async function runBuildConfigStep({
 
   const mergedContractAddrs = getMergedContractAddresses(artifacts);
 
-  logGray(
-    'Contract addresses from artifacts:\n',
-    JSON.stringify(mergedContractAddrs[baseChainName], null, 4),
-  );
-
   // Create configs that coalesce together values from the config file,
   // the artifacts, and the SDK as a fallback
   const configMap: ChainMap<TokenConfig & RouterConfig> = {
@@ -130,12 +128,12 @@ async function runBuildConfigStep({
           ? base.address!
           : ethers.constants.AddressZero,
       owner,
-      mailbox: base.mailbox || mergedContractAddrs[baseChainName].mailbox,
+      mailbox: base.mailbox || mergedContractAddrs[baseChainName]?.mailbox,
       interchainSecurityModule:
         base.interchainSecurityModule ||
-        mergedContractAddrs[baseChainName].interchainSecurityModule ||
-        mergedContractAddrs[baseChainName].multisigIsm,
-      // ismFactory: mergedContractAddrs[baseChainName].routingIsmFactory, // fix when updating from routingIsm
+        mergedContractAddrs[baseChainName]?.interchainSecurityModule ||
+        mergedContractAddrs[baseChainName]?.multisigIsm,
+      // ismFactory: mergedContractAddrs[baseChainName].routingIsmFactory, // TODO fix when updating from routingIsm
       foreignDeployment: base.foreignDeployment,
       name: baseMetadata.name,
       symbol: baseMetadata.symbol,
@@ -154,9 +152,9 @@ async function runBuildConfigStep({
       mailbox: synthetic.mailbox || mergedContractAddrs[sChainName].mailbox,
       interchainSecurityModule:
         synthetic.interchainSecurityModule ||
-        mergedContractAddrs[sChainName].interchainSecurityModule ||
-        mergedContractAddrs[sChainName].multisigIsm,
-      // ismFactory: mergedContractAddrs[sChainName].routingIsmFactory, // fix
+        mergedContractAddrs[sChainName]?.interchainSecurityModule ||
+        mergedContractAddrs[sChainName]?.multisigIsm,
+      // ismFactory: mergedContractAddrs[sChainName].routingIsmFactory, // TODO fix
       foreignDeployment: synthetic.foreignDeployment,
     };
   }
diff --git a/typescript/cli/src/utils/files.ts b/typescript/cli/src/utils/files.ts
index 7d57dec276..aa0cfd65f5 100644
--- a/typescript/cli/src/utils/files.ts
+++ b/typescript/cli/src/utils/files.ts
@@ -6,14 +6,24 @@ import { parse as yamlParse, stringify as yamlStringify } from 'yaml';
 
 import { objMerge } from '@hyperlane-xyz/utils';
 
-import { logBlue } from '../../logger.js';
+import { log, logBlue } from '../../logger.js';
 
 import { getTimestampForFilename } from './time.js';
 
 export type FileFormat = 'yaml' | 'json';
 
+export function isFile(filepath: string) {
+  if (!filepath) return false;
+  try {
+    return fs.existsSync(filepath) && fs.lstatSync(filepath).isFile();
+  } catch (error) {
+    log(`Error checking for file: ${filepath}`);
+    return false;
+  }
+}
+
 export function readFileAtPath(filepath: string) {
-  if (!fs.existsSync(filepath)) {
+  if (!isFile(filepath)) {
     throw Error(`File doesn't exist at ${filepath}`);
   }
   return fs.readFileSync(filepath, 'utf8');
@@ -21,7 +31,7 @@ export function readFileAtPath(filepath: string) {
 
 export function writeFileAtPath(filepath: string, value: string) {
   const dirname = path.dirname(filepath);
-  if (!fs.existsSync(dirname)) {
+  if (!isFile(dirname)) {
     fs.mkdirSync(dirname, { recursive: true });
   }
   fs.writeFileSync(filepath, value);
@@ -47,7 +57,7 @@ export function mergeJson<T extends Record<string, any>>(
   filepath: string,
   obj: T,
 ) {
-  if (fs.existsSync(filepath)) {
+  if (isFile(filepath)) {
     const previous = readJson<T>(filepath);
     writeJson(filepath, objMerge(previous, obj));
   } else {
@@ -75,7 +85,7 @@ export function mergeYaml<T extends Record<string, any>>(
   filepath: string,
   obj: T,
 ) {
-  if (fs.existsSync(filepath)) {
+  if (isFile(filepath)) {
     const previous = readYaml<T>(filepath);
     writeYaml(filepath, objMerge(previous, obj));
   } else {