diff --git a/src/gateway/server-cron.ts b/src/gateway/server-cron.ts
index 7430870f111..2361e349c47 100644
--- a/src/gateway/server-cron.ts
+++ b/src/gateway/server-cron.ts
@@ -186,12 +186,12 @@ export function buildGatewayCronService(params: {
       // fully resolved agent heartbeat config so cron-triggered heartbeats
       // respect agent-specific overrides (agents.list[].heartbeat) before
       // falling back to agents.defaults.heartbeat.
-      const agentEntry =
-        Array.isArray(runtimeConfig.agents?.list) &&
-        runtimeConfig.agents.list.find(
-          (entry) =>
-            entry && typeof entry.id === "string" && normalizeAgentId(entry.id) === agentId,
-        );
+      const agentEntry = Array.isArray(runtimeConfig.agents?.list)
+        ? runtimeConfig.agents.list.find(
+            (entry) =>
+              entry && typeof entry.id === "string" && normalizeAgentId(entry.id) === agentId,
+          )
+        : undefined;
       const baseHeartbeat = {
         ...runtimeConfig.agents?.defaults?.heartbeat,
         ...agentEntry?.heartbeat,