diff --git a/assets/js/checkPay.js b/assets/js/checkPay.js
index 033d6ce..16bd9ab 100644
--- a/assets/js/checkPay.js
+++ b/assets/js/checkPay.js
@@ -39,16 +39,16 @@ $(document).ready(function() {
 
     //Comprueba que el NÚMERO de la tarjeta es válido.
     $("#card-number-0").change(function(){
+        const cardNumber0 = $("#card-number-0");
+        cardNumber0[0].setCustomValidity("");
         $("#card-number-1").change(function(){
+            const cardNumber1 = $("#card-number-1");
+            cardNumber1[0].setCustomValidity("");
             $("#card-number-2").change(function(){
-                $("#card-number-3").change(function(){
-                    const cardNumber0 = $("#card-number-0");
-                    const cardNumber1 = $("#card-number-1");
-                    const cardNumber2 = $("#card-number-2");
+                const cardNumber2 = $("#card-number-2");
+                cardNumber2[0].setCustomValidity("");
+                $("#card-number-3").change(function(){                  
                     const cardNumber3 = $("#card-number-3");
-                    cardNumber0[0].setCustomValidity("");
-                    cardNumber1[0].setCustomValidity("");
-                    cardNumber2[0].setCustomValidity("");
                     cardNumber3[0].setCustomValidity("");
 
                     if( (cardNumber0.val().length + cardNumber1.val().length + cardNumber2.val().length +cardNumber3.val().length) === 16 ){
diff --git a/panel_user/panelUser.php b/panel_user/panelUser.php
index cd6891e..bb3aefc 100644
--- a/panel_user/panelUser.php
+++ b/panel_user/panelUser.php
@@ -91,26 +91,26 @@
         static function purchases(){
             require_once('../assets/php/includes/purchase_dao.php');
 
+            $purchasesHTML = '';
+
             $purchaseDAO = new PurchaseDAO("complucine");
             $purchases = $purchaseDAO->allPurchasesData(unserialize($_SESSION['user'])->getId());
 
-            $sessions = array();
-            $halls = array();
-            $cinemas = array();
-            $rows = array();
-            $columns = array();
-            $dates = array();
-            foreach($purchases as $key=>$value){
-                $sessions[$key] = $value->getSessionId();
-                $halls[$key] = $value->getHallId();
-                $cinemas[$key] = $value->getCinemaId();
-                $rows[$key] = $value->getRow();
-                $columns[$key] = $value->getColumn();
-                $dates[$key] = $value->getTime();
-            }
-
-            $purchasesHTML = '';
-            if(count($purchases) > 0){
+            if($purchases){
+                $sessions = array();
+                $halls = array();
+                $cinemas = array();
+                $rows = array();
+                $columns = array();
+                $dates = array();
+                foreach($purchases as $key=>$value){
+                    $sessions[$key] = $value->getSessionId();
+                    $halls[$key] = $value->getHallId();
+                    $cinemas[$key] = $value->getCinemaId();
+                    $rows[$key] = $value->getRow();
+                    $columns[$key] = $value->getColumn();
+                    $dates[$key] = $value->getTime();
+                }
                 for($i = 0; $i < count($purchases); $i++){
                     if($i%2 === 0){
                         if($i != 0) $purchasesHTML .= '</div>