diff --git a/docs_v1.0/doc_wasm/index.html b/docs_v1.0/doc_wasm/index.html
index 7121e38..9e9c960 100644
--- a/docs_v1.0/doc_wasm/index.html
+++ b/docs_v1.0/doc_wasm/index.html
@@ -70,13 +70,15 @@ async function loadDoc(name) {
     if (!resp.ok) throw new Error('HTTP ' + resp.status);
     const md = await resp.text();
     if (!wasm) throw new Error('WASM not initialized');
-    el.innerHTML = wasm.render(md);
-    document.querySelectorAll('.sidebar a.module-link').forEach(a => a.classList.remove('active'));
-    const link = document.querySelector('.sidebar a[data-module="' + name + '"]');
+    var html = wasm.render(md);
+    if (html.length === 0) throw new Error('WASM render returned empty HTML');
+    el.innerHTML = html;
+    document.querySelectorAll('.sidebar a.module-link').forEach(function(a) { a.classList.remove('active'); });
+    var link = document.querySelector('.sidebar a[data-module="' + name + '"]');
     if (link) link.classList.add('active');
     history.pushState(null, '', '#' + name);
   } catch(e) {
-    el.innerHTML = '<p style="color:red">Error: ' + e.message + '</p>';
+    el.innerHTML = '<p style="color:red">Error: ' + e.message + '</p><pre style="font-size:12px;background:#f8f8f8;padding:8px">' + e.stack + '</pre>';
   }
 }
 
@@ -99,9 +101,9 @@ async function init() {
       window.location.reload();
     };
     var hash = location.hash.slice(1);
-    loadDoc(hash || '01_auth');
+    await loadDoc(hash || '01_auth');
   } catch(e) {
-    el.innerHTML = '<p style="color:red">Init error: ' + e.message + '</p>';
+    el.innerHTML = '<p style="color:red">Init error: ' + e.message + '</p><pre style="font-size:12px;background:#f8f8f8;padding:8px">' + e.stack + '</pre>';
   }
 }