fix render

src/app.js

@@ -2861,42 +2861,54 @@ function renderView() {
     themeLabel.textContent = t("ui.theme");
   }
 
-  switch (currentView) {
-    case "dashboard":
-      renderDashboard();
-      break;
-    case "events":
-      renderEvents();
-      break;
-    case "race_setup":
-      renderRaceSetup();
-      break;
-    case "classes":
-      renderClasses();
-      break;
-    case "drivers":
-      renderDrivers();
-      break;
-    case "cars":
-      renderCars();
-      break;
-    case "timing":
-      renderTiming();
-      break;
-    case "judging":
-      renderJudging();
-      break;
-    case "overlay":
-      renderOverlay();
-      break;
-    case "settings":
-      renderSettings();
-      break;
-    case "guide":
-      renderGuide();
-      break;
-    default:
-      renderDashboard();
+  try {
+    switch (currentView) {
+      case "dashboard":
+        renderDashboard();
+        break;
+      case "events":
+        renderEvents();
+        break;
+      case "race_setup":
+        renderRaceSetup();
+        break;
+      case "classes":
+        renderClasses();
+        break;
+      case "drivers":
+        renderDrivers();
+        break;
+      case "cars":
+        renderCars();
+        break;
+      case "timing":
+        renderTiming();
+        break;
+      case "judging":
+        renderJudging();
+        break;
+      case "overlay":
+        renderOverlay();
+        break;
+      case "settings":
+        renderSettings();
+        break;
+      case "guide":
+        renderGuide();
+        break;
+      default:
+        renderDashboard();
+    }
+  } catch (error) {
+    console.error("renderView failed", error);
+    dom.view.innerHTML = `
+      <section class="panel">
+        <div class="panel-header"><h3>Render error</h3></div>
+        <div class="panel-body">
+          <p>${escapeHtml(error instanceof Error ? error.message : String(error))}</p>
+        </div>
+      </section>
+    `;
   }
 
   updateHeaderState();
@@ -3202,8 +3214,8 @@ function handleSessionTimerTick() {
 function renderDashboard() {
   const active = getActiveSession();
   const schedule = getScheduleDriftSummary();
-  const totalPassings = Object.values(state.resultsBySession).reduce(
-    (sum, x) => sum + (x.passings?.length || 0),
+  const totalPassings = Object.values(state.resultsBySession || {}).reduce(
+    (sum, x) => sum + (x?.passings?.length || 0),
     0
   );
   const backendUrl = getBackendUrl();