diff --git a/src/main/resources/META-INF/resources/static/js/shots.js b/src/main/resources/META-INF/resources/static/js/shots.js
index 8528985..01a9470 100644
--- a/src/main/resources/META-INF/resources/static/js/shots.js
+++ b/src/main/resources/META-INF/resources/static/js/shots.js
@@ -1,9 +1,6 @@
 window.shots = {
   generateUid() {
-    if (typeof crypto !== 'undefined' && typeof crypto.randomUUID === 'function') {
-      return crypto.randomUUID();
-    }
-    return Date.now().toString(36) + '-' + Math.random().toString(36).slice(2, 10);
+    return window.uid();
   },
   WEIGHTS: {
     Soulshot:           { D: 3, C: 3, B: 2, A: 2, S: 2 },
@@ -84,7 +81,7 @@ window.shots = {
       const grado = m[2].toUpperCase();
       const cantidad = parseInt(m[3].replace(/[.,]/g, ''), 10);
       if (!this.WEIGHTS[tipo]?.[grado]) continue;
-      parsed.push({ uid: this.generateUid(), tipo, grado, cantidad });
+      parsed.push({ uid: window.uid(), tipo, grado, cantidad });
     }
     return parsed;
   },
diff --git a/src/main/resources/META-INF/resources/static/js/uid.js b/src/main/resources/META-INF/resources/static/js/uid.js
new file mode 100644
index 0000000..a496ec5
--- /dev/null
+++ b/src/main/resources/META-INF/resources/static/js/uid.js
@@ -0,0 +1,6 @@
+window.uid = function () {
+  if (typeof crypto !== 'undefined' && typeof crypto.randomUUID === 'function') {
+    return crypto.randomUUID();
+  }
+  return Date.now().toString(36) + '-' + Math.random().toString(36).slice(2, 10);
+};
diff --git a/src/main/resources/templates/PageResource/personajes.html b/src/main/resources/templates/PageResource/personajes.html
index a248b67..b2bc5dc 100644
--- a/src/main/resources/templates/PageResource/personajes.html
+++ b/src/main/resources/templates/PageResource/personajes.html
@@ -205,6 +205,7 @@
 
   <script src="/static/js/defaults.js?v=7"></script>
   <script src="/static/js/api.js?v=7"></script>
+  <script src="/static/js/uid.js?v=7"></script>
   <script src="/static/js/shots.js?v=7"></script>
   <script src="/static/js/app.js?v=7"></script>
   <script defer src="/static/js/alpine.min.js?v=7"></script>
diff --git a/src/main/resources/templates/PageResource/ventas.html b/src/main/resources/templates/PageResource/ventas.html
index a1501c5..a97d628 100644
--- a/src/main/resources/templates/PageResource/ventas.html
+++ b/src/main/resources/templates/PageResource/ventas.html
@@ -227,11 +227,12 @@
     </p>
   </footer>
 
-  <script src="/static/js/defaults.js?v=6"></script>
-  <script src="/static/js/api.js?v=6"></script>
-  <script src="/static/js/shots.js?v=6"></script>
-  <script src="/static/js/app.js?v=6"></script>
-  <script defer src="/static/js/alpine.min.js?v=6"></script>
+  <script src="/static/js/defaults.js?v=7"></script>
+  <script src="/static/js/api.js?v=7"></script>
+  <script src="/static/js/uid.js?v=7"></script>
+  <script src="/static/js/shots.js?v=7"></script>
+  <script src="/static/js/app.js?v=7"></script>
+  <script defer src="/static/js/alpine.min.js?v=7"></script>
 
   <script>
     document.addEventListener('alpine:init', () => {
@@ -265,8 +266,13 @@
         },
 
         async init() {
+          if (!window.shots || !window.uid) {
+            this.error = 'Error cargando utilidades de la pagina (shots/uid). Recarga con Ctrl+Shift+R.';
+            return;
+          }
           await Promise.all([this.loadSales(), this.loadCharacters()]);
-          document.addEventListener('visibilitychange', this.visibilityHandler);
+          this._boundVisibility = this.visibilityHandler.bind(this);
+          document.addEventListener('visibilitychange', this._boundVisibility);
           this.tick();
         },
 
@@ -283,7 +289,7 @@
         },
 
         destroy() {
-          document.removeEventListener('visibilitychange', this.visibilityHandler);
+          document.removeEventListener('visibilitychange', this._boundVisibility);
           if (this.timer) clearTimeout(this.timer);
         },
 
@@ -305,7 +311,7 @@
         },
 
         addItem() {
-          this.form.items.push({ uid: window.shots.generateUid(), tipo: '', grado: '', cantidad: null });
+          this.form.items.push({ uid: window.uid(), tipo: '', grado: '', cantidad: null });
         },
 
         removeItem(idx) {