diff --git a/src/index.ts b/src/index.ts
index 031216bdc..408b94a89 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -119,10 +119,10 @@ const isMain =
 if (isMain) {
   // Global error handlers to prevent silent crashes from unhandled rejections/exceptions.
   // These log the error and exit gracefully instead of crashing without trace.
-  process.on("unhandledRejection", (reason, promise) => {
+  process.on("unhandledRejection", (reason, _promise) => {
     console.error(
       "[warelay] Unhandled promise rejection:",
-      reason instanceof Error ? reason.stack ?? reason.message : reason,
+      reason instanceof Error ? (reason.stack ?? reason.message) : reason,
     );
     process.exit(1);
   });
diff --git a/src/web/auto-reply.ts b/src/web/auto-reply.ts
index 1ee1d7177..452fb0f91 100644
--- a/src/web/auto-reply.ts
+++ b/src/web/auto-reply.ts
@@ -45,7 +45,7 @@ export type WebMonitorTuning = {
 const formatDuration = (ms: number) =>
   ms >= 1000 ? `${(ms / 1000).toFixed(2)}s` : `${ms}ms`;
 
-const DEFAULT_REPLY_HEARTBEAT_MINUTES = 10;
+const DEFAULT_REPLY_HEARTBEAT_MINUTES = 30;
 export const HEARTBEAT_TOKEN = "HEARTBEAT_OK";
 export const HEARTBEAT_PROMPT = "HEARTBEAT ultrathink";
 
diff --git a/src/web/session.ts b/src/web/session.ts
index 76e32599f..545291ebf 100644
--- a/src/web/session.ts
+++ b/src/web/session.ts
@@ -90,7 +90,10 @@ export async function createWaSocket(printQr: boolean, verbose: boolean) {
   );
 
   // Handle WebSocket-level errors to prevent unhandled exceptions from crashing the process
-  if (sock.ws) {
+  if (
+    sock.ws &&
+    typeof (sock.ws as unknown as { on?: unknown }).on === "function"
+  ) {
     sock.ws.on("error", (err: Error) => {
       sessionLogger.error({ error: String(err) }, "WebSocket error");
     });