diff --git a/conversations.php b/conversations.php
index b391840..c0a547e 100644
--- a/conversations.php
+++ b/conversations.php
@@ -665,6 +665,29 @@
     <?php $asset_v = file_exists(__DIR__ . '/assets/js/chat-common.js') ? filemtime(__DIR__ . '/assets/js/chat-common.js') : time(); ?>
     <script src="assets/js/chat-common.js?v=<?php echo $asset_v; ?>"></script>
     <script>
+        // Fallback ligero para showAlert (si no existe una implementación global)
+        if (typeof showAlert === 'undefined') {
+            function showAlert(message, type = 'info') {
+                try {
+                    let container = document.getElementById('notification-toasts');
+                    if (!container) {
+                        container = document.createElement('div');
+                        container.id = 'notification-toasts';
+                        document.body.appendChild(container);
+                    }
+                    const toast = document.createElement('div');
+                    toast.className = 'notification-toast small' + (type === 'success' ? ' cool' : '');
+                    const icon = type === 'success' ? '✅' : (type === 'danger' ? '⚠️' : (type === 'warning' ? '⚠' : 'ℹ️'));
+                    toast.innerHTML = `<span class="nt-icon">${icon}</span><div style="flex:1; font-size:13px">${message}</div>`;
+                    container.appendChild(toast);
+                    setTimeout(() => { if (toast.parentNode) toast.remove(); }, type === 'success' ? 4000 : 8000);
+                } catch (e) {
+                    // fallback to alert if DOM fails
+                    try { alert(message); } catch (e2) { /* ignore */ }
+                }
+            }
+        }
+
         class WhatsAppChat {
             constructor() {
                 this.currentConversationId = null;
@@ -1716,7 +1739,7 @@
                     this.hideReplyPreview();
                     if (resp && resp.success) {
                         this.addMessageToView(`Plantilla: ${templateName}`, 'outgoing');
-                        showAlert && showAlert('Mensaje de plantilla enviado correctamente', 'success');
+                        typeof showAlert !== 'undefined' && showAlert('Mensaje de plantilla enviado correctamente', 'success');
                         await this.loadconversations(this.currentUserId, false);
                         await this.loadConversations();
                     } else {
@@ -1845,7 +1868,7 @@
                                 input.value = '';
                                 // Mostrar inmediatamente en la vista
                                 this.addMessageToView(message, 'outgoing');
-                                showAlert && showAlert('Mensaje enviado correctamente', 'success');
+                                typeof showAlert !== 'undefined' && showAlert('Mensaje enviado correctamente', 'success');
                                 // Recargar mensajes y conversaciones en background
                                 this.loadconversations(this.currentUserId, false).catch(e=>console.warn(e));
                                 this.loadConversations().catch(e=>console.warn(e));