diff --git a/webapp/main.py b/webapp/main.py
index 70b1d6a..d9c14f9 100644
--- a/webapp/main.py
+++ b/webapp/main.py
@@ -216,12 +216,14 @@ def viewer(
     home: Optional[str] = Query(None),
 ):
     sections = fetch_sections(prefix)
+    # Escape < so </script> inside text_html cannot break the page script tag
+    sections_json = json.dumps(sections, ensure_ascii=False, default=str).replace("<", "\\u003c")
     home_url = "/home-image" if (home or HOME_IMAGE or (BASE_DIR.parent / "Bairaci.png").exists()) else None
     return templates.TemplateResponse(
         request,
         "viewer.html",
         {
-            "sections_json": json.dumps(sections, ensure_ascii=False, default=str),
+            "sections_json": sections_json,
             "section_count": len(sections),
             "prefix": prefix or "",
             "home_url": home_url,
diff --git a/webapp/templates/viewer.html b/webapp/templates/viewer.html
index 55b8e88..d7d81aa 100644
--- a/webapp/templates/viewer.html
+++ b/webapp/templates/viewer.html
@@ -335,21 +335,44 @@
 
 <div id="toast"></div>
 
+<script type="application/json" id="sections-data">{{ sections_json | safe }}</script>
 <script>
-const ALL = {{ sections_json | safe }};
+let ALL = [];
+try {
+  ALL = JSON.parse(document.getElementById('sections-data').textContent || '[]');
+} catch (e) {
+  console.error('sections JSON parse failed', e);
+  ALL = [];
+}
 
-document.getElementById('total-count').textContent = ALL.length + ' секции';
-renderEditor(ALL);
-renderKwCloud();
-doSearch();
-renderGenerator();
+function esc(s) {
+  return String(s ?? '')
+    .replace(/&/g,'&amp;').replace(/</g,'&lt;')
+    .replace(/>/g,'&gt;').replace(/"/g,'&quot;');
+}
+function shortPath(p) {
+  if (!p) return '';
+  const parts = String(p).replace(/\\/g,'/').split('/');
+  return parts.slice(-2).join('/');
+}
+function toast(msg, isErr) {
+  const el = document.getElementById('toast');
+  if (!el) return;
+  el.textContent = msg;
+  el.classList.toggle('error', !!isErr);
+  el.classList.add('show');
+  clearTimeout(toast._t);
+  toast._t = setTimeout(() => el.classList.remove('show'), 2800);
+}
 
 function switchTab(name) {
   const order = [{% if home_url %}'home',{% endif %}'editor','search','generator'];
   document.querySelectorAll('.tab').forEach((t,i) => t.classList.toggle('active', order[i] === name));
   document.querySelectorAll('.panel').forEach(p => p.classList.remove('active'));
-  document.getElementById('tab-' + name).classList.add('active');
+  const panel = document.getElementById('tab-' + name);
+  if (panel) panel.classList.add('active');
   if (name === 'generator') renderGenerator();
+  if (name === 'search') doSearch();
 }
 
 async function startRescan() {
@@ -703,28 +726,24 @@ ${bodyAbs}
 </body></html>`;
 }
 
-// ── UTILS ─────────────────────────────
-function esc(s) {
-  return String(s||'').replace(/&/g,'&amp;').replace(/</g,'&lt;').replace(/>/g,'&gt;').replace(/"/g,'&quot;');
-}
-function shortPath(p) {
-  if (!p) return '';
-  const parts = p.replace(/\\/g,'/').split('/');
-  return parts.slice(-2).join('/');
-}
-function toast(msg, isError) {
-  const el = document.getElementById('toast');
-  el.textContent = msg;
-  el.classList.toggle('error', !!isError);
-  el.classList.add('show');
-  setTimeout(() => el.classList.remove('show'), 3000);
-}
 function download(filename, content, mime) {
   const a = document.createElement('a');
   a.href = URL.createObjectURL(new Blob([content], {type: mime}));
   a.download = filename;
   a.click();
 }
+
+// ── INIT ─────────────────────────────
+document.getElementById('total-count').textContent = ALL.length + ' секции';
+try {
+  renderEditor(ALL);
+  renderKwCloud();
+  doSearch();
+  renderGenerator();
+} catch (e) {
+  console.error('init failed', e);
+  toast('Грешка при зареждане на UI: ' + e.message, true);
+}
 </script>
 </body>
 </html>