fix(monitoring): tolerate null API payloads

Normalize monitoring API responses before rendering so empty or error payloads with data:null cannot crash the dashboard. Also guard chart, token, and box session arrays before reading length/map.

web/src/app/home/monitoring/components/TokenMonitoring.tsx

@@ -164,7 +164,7 @@ export default function TokenMonitoring({
   }, [fetchStats]);
 
   const chartData = useMemo(() => {
-    if (!stats) return [];
+    if (!stats || !Array.isArray(stats.timeseries)) return [];
     return stats.timeseries.map((p) => ({
       bucket: p.bucket,
       input: p.input_tokens,
@@ -198,7 +198,7 @@ export default function TokenMonitoring({
     );
   }
 
-  if (!stats || stats.summary.total_calls === 0) {
+  if (!stats || !stats.summary || stats.summary.total_calls === 0) {
     return (
       <div className="bg-card rounded-xl border p-6">
         <div className="h-[260px] flex flex-col items-center justify-center text-muted-foreground gap-2">
@@ -209,7 +209,8 @@ export default function TokenMonitoring({
     );
   }
 
-  const { summary, by_model } = stats;
+  const summary = stats.summary;
+  const by_model = Array.isArray(stats.by_model) ? stats.by_model : [];
 
   return (
     <div className="space-y-6">

web/src/app/home/monitoring/components/overview-cards/SystemStatusCards.tsx

@@ -74,7 +74,7 @@ export default function SystemStatusCard({
         : await httpClient.getBoxSessions().catch(() => [] as BoxSessionInfo[]);
       setPluginStatus(plugin);
       setBoxStatus(box);
-      setBoxSessions(sessions);
+      setBoxSessions(Array.isArray(sessions) ? sessions : []);
     } finally {
       setLoading(false);
     }

web/src/app/home/monitoring/components/overview-cards/TrafficChart.tsx

@@ -34,14 +34,16 @@ export default function TrafficChart({
   const { t } = useTranslation();
 
   const chartData = useMemo(() => {
-    if (!messages.length && !llmCalls.length) {
+    const safeMessages = Array.isArray(messages) ? messages : [];
+    const safeLlmCalls = Array.isArray(llmCalls) ? llmCalls : [];
+    if (!safeMessages.length && !safeLlmCalls.length) {
       return [];
     }
 
     // Combine all timestamps and find the range
     const allTimestamps = [
-      ...messages.map((m) => m.timestamp.getTime()),
-      ...llmCalls.map((c) => c.timestamp.getTime()),
+      ...safeMessages.map((m) => m.timestamp.getTime()),
+      ...safeLlmCalls.map((c) => c.timestamp.getTime()),
     ];
 
     if (allTimestamps.length === 0) return [];
@@ -99,7 +101,7 @@ export default function TrafficChart({
     }
 
     // Count messages per bucket
-    messages.forEach((msg) => {
+    safeMessages.forEach((msg) => {
       const bucket =
         Math.floor(msg.timestamp.getTime() / bucketSize) * bucketSize;
       const point = buckets.get(bucket);
@@ -109,7 +111,7 @@ export default function TrafficChart({
     });
 
     // Count LLM calls per bucket
-    llmCalls.forEach((call) => {
+    safeLlmCalls.forEach((call) => {
       const bucket =
         Math.floor(call.timestamp.getTime() / bucketSize) * bucketSize;
       const point = buckets.get(bucket);

web/src/app/home/monitoring/hooks/useMonitoringData.ts

@@ -92,18 +92,46 @@ export function useMonitoringData(filterState: FilterState) {
         limit: 50,
       });
 
+      const overview = response?.overview ?? {
+        total_messages: 0,
+        llm_calls: 0,
+        embedding_calls: 0,
+        model_calls: 0,
+        success_rate: 100,
+        active_sessions: 0,
+      };
+      const messages = Array.isArray(response?.messages)
+        ? response.messages
+        : [];
+      const llmCalls = Array.isArray(response?.llmCalls)
+        ? response.llmCalls
+        : [];
+      const embeddingCalls = Array.isArray(response?.embeddingCalls)
+        ? response.embeddingCalls
+        : [];
+      const sessions = Array.isArray(response?.sessions)
+        ? response.sessions
+        : [];
+      const errors = Array.isArray(response?.errors) ? response.errors : [];
+      const totalCount = response?.totalCount ?? {
+        messages: messages.length,
+        llmCalls: llmCalls.length,
+        embeddingCalls: embeddingCalls.length,
+        sessions: sessions.length,
+        errors: errors.length,
+      };
+
       // Transform the response to match MonitoringData interface
       const transformedData: MonitoringData = {
         overview: {
-          totalMessages: response.overview.total_messages,
-          llmCalls: response.overview.llm_calls,
-          embeddingCalls: response.overview.embedding_calls || 0,
-          modelCalls:
-            response.overview.model_calls || response.overview.llm_calls,
-          successRate: response.overview.success_rate,
-          activeSessions: response.overview.active_sessions,
+          totalMessages: overview.total_messages,
+          llmCalls: overview.llm_calls,
+          embeddingCalls: overview.embedding_calls || 0,
+          modelCalls: overview.model_calls || overview.llm_calls,
+          successRate: overview.success_rate,
+          activeSessions: overview.active_sessions,
         },
-        messages: response.messages.map(
+        messages: messages.map(
           (msg: {
             id: string;
             timestamp: string;
@@ -136,7 +164,7 @@ export function useMonitoringData(filterState: FilterState) {
             variables: msg.variables,
           }),
         ),
-        llmCalls: response.llmCalls.map(
+        llmCalls: llmCalls.map(
           (call: {
             id: string;
             timestamp: string;
@@ -173,7 +201,7 @@ export function useMonitoringData(filterState: FilterState) {
             messageId: call.message_id,
           }),
         ),
-        embeddingCalls: (response.embeddingCalls || []).map(
+        embeddingCalls: embeddingCalls.map(
           (call: {
             id: string;
             timestamp: string;
@@ -208,7 +236,7 @@ export function useMonitoringData(filterState: FilterState) {
         ),
         // Create merged modelCalls array from llmCalls and embeddingCalls
         modelCalls: [] as ModelCall[], // Will be populated after transform
-        sessions: response.sessions.map(
+        sessions: sessions.map(
           (session: {
             session_id: string;
             bot_id: string;
@@ -236,7 +264,7 @@ export function useMonitoringData(filterState: FilterState) {
             userId: session.user_id,
           }),
         ),
-        errors: response.errors.map(
+        errors: errors.map(
           (error: {
             id: string;
             timestamp: string;
@@ -264,11 +292,11 @@ export function useMonitoringData(filterState: FilterState) {
           }),
         ),
         totalCount: {
-          messages: response.totalCount.messages,
-          llmCalls: response.totalCount.llmCalls,
-          embeddingCalls: response.totalCount.embeddingCalls || 0,
-          sessions: response.totalCount.sessions,
-          errors: response.totalCount.errors,
+          messages: totalCount.messages,
+          llmCalls: totalCount.llmCalls,
+          embeddingCalls: totalCount.embeddingCalls || 0,
+          sessions: totalCount.sessions,
+          errors: totalCount.errors,
         },
       };