diff --git a/frontend/flashcards.html b/frontend/flashcards.html
index 8377a4e..9078d8c 100644
--- a/frontend/flashcards.html
+++ b/frontend/flashcards.html
@@ -802,14 +802,24 @@ async function persistCardOrder() {
 }
 
 async function addCard() {
-  if (!_curDeck) return;
+  if (!_curDeck) { LS.toast('Сначала откройте колоду', 'error'); return; }
   const front = document.getElementById('new-card-front').value.trim();
   const back  = document.getElementById('new-card-back').value.trim();
-  if (!front && !back && !_newImg.front && !_newImg.back) return;
-  const card = await LS.api(`/api/flashcards/decks/${_curDeck.id}/cards`, {
-    method: 'POST',
-    body: JSON.stringify({ front, back, front_image: _newImg.front, back_image: _newImg.back })
-  }).catch(()=>null);
+  if (!front && !back && !_newImg.front && !_newImg.back) {
+    LS.toast('Введите вопрос или ответ карточки');
+    document.getElementById('new-card-front').focus();
+    return;
+  }
+  let card;
+  try {
+    card = await LS.api(`/api/flashcards/decks/${_curDeck.id}/cards`, {
+      method: 'POST',
+      body: JSON.stringify({ front, back, front_image: _newImg.front, back_image: _newImg.back })
+    });
+  } catch (e) {
+    LS.toast('Не удалось добавить карточку: ' + (e && e.message || 'ошибка'), 'error');
+    return;
+  }
   if (!card) return;
   _cards.push(card);
   document.getElementById('new-card-front').value = '';