diff --git a/web/js/app.js b/web/js/app.js
index cb9ecd9..795b953 100644
--- a/web/js/app.js
+++ b/web/js/app.js
@@ -385,7 +385,7 @@
           const content = t.content.length > DRAFT_MAX ? t.content.slice(0, DRAFT_MAX) : t.content;
           return { draft: { title: t.title, format: t.format, categories: t.categories, content } };
         });
-        const active = state.tabs.findIndex((t) => t.key === state.activeKey);
+        const active = Math.max(0, state.tabs.findIndex((t) => t.key === state.activeKey));
         localStorage.setItem(TABS_KEY, JSON.stringify({ open, active }));
       } catch { /* quota cheia: ignora */ }
     }, 400);
@@ -415,8 +415,10 @@
       }
       if (!opened.length) opened.push(newTab());
     }
+    // índice salvo pode ser inválido (-1 de sessão encerrada sem aba ativa, etc.)
     state.tabs = opened;
-    const want = saved && Number.isInteger(saved.active) ? Math.min(saved.active, opened.length - 1) : 0;
+    const raw = saved && Number.isInteger(saved.active) ? saved.active : 0;
+    const want = Math.min(Math.max(0, raw), opened.length - 1);
     activateTab(opened[want].key);
   }
 
@@ -2026,7 +2028,13 @@
   async function boot() {
     applyPrefs();
     await Promise.all([loadNotes(), loadAggregates()]);
-    await restoreTabs();
+    try {
+      await restoreTabs();
+    } catch (err) {
+      console.error('restoreTabs falhou', err);
+      state.tabs = [newTab()];
+      activateTab(state.tabs[0].key);
+    }
     updateStatus();
     state.booted = true;
     refreshInstallUI();
diff --git a/web/sw.js b/web/sw.js
index 71a56c4..e71beec 100644
--- a/web/sw.js
+++ b/web/sw.js
@@ -1,7 +1,7 @@
 /* Service Worker do Notas — caches versionados.
  * BUMP de CACHE em todo deploy que mude shell/assets (o activate limpa os antigos).
  */
-const CACHE = 'notas-shell-v2';
+const CACHE = 'notas-shell-v3';
 const SHELL = [
   '/',
   '/css/app.css',