diff --git a/server/openai.ts b/server/openai.ts
index 2650f81..7d4bf52 100644
--- a/server/openai.ts
+++ b/server/openai.ts
@@ -91,7 +91,15 @@ async function fetchRecentAlerts(): Promise<string> {
     if (recentAlerts.length === 0) return "No recent security alerts.";
     
     return `RECENT ALERTS:
-${recentAlerts.map(alert => `- ${alert.type}: ${alert.message} (${new Date(alert.created_at).toLocaleString()})`).join('\n')}`;
+${recentAlerts.map(alert => {
+  let dateStr = 'unknown';
+  if (alert.created_at) {
+    try {
+      dateStr = new Date(alert.created_at).toLocaleString();
+    } catch {}
+  }
+  return `- ${alert.type}: ${alert.message} (${dateStr})`;
+}).join('\n')}`;
   } catch (error) {
     return "Alert system offline - potential network intrusion.";
   }
diff --git a/server/websocket.ts b/server/websocket.ts
index db34df2..8f1a428 100644
--- a/server/websocket.ts
+++ b/server/websocket.ts
@@ -159,7 +159,7 @@ function startPeriodicUpdates(io: SocketIOServer) {
       const alerts = await storage.getAlerts();
       const newAlerts = alerts.filter(a => 
         !a.is_resolved && 
-        new Date(a.created_at) > lastAlertCheck
+        a.created_at && !isNaN(new Date(a.created_at).getTime()) && new Date(a.created_at) > lastAlertCheck
       );
 
       if (newAlerts.length > 0) {