diff --git a/index.html b/index.html
index 815f7c6..3965d50 100644
--- a/index.html
+++ b/index.html
@@ -152,11 +152,11 @@
 	</tr>
     </table>
     <div class="credits">
-		<b>JVON Web</b><br/>
+		<b>JVON Web 1.1.2</b><br/>
 		{{strings.credits_description}}&nbsp;<b>{{strings.credits_john}}</b><br/>
 		{{strings.credits_cromer}}<br/>
-		Ingeniería Civil en Informática, Universidad del Bío Bío, 2015<br/>
-		<a target="_blank" href="jvon-1.1.1.apk">Version android</a>
+		Ingeniería Civil en Informática, Universidad del Bío Bío, 2015-2020<br/>
+		<!--<a target="_blank" href="jvon-1.1.1.apk">Version android</a>-->
     </div>
 </body>
 </html>
diff --git a/js/jvon-interpret.js b/js/jvon-interpret.js
index 1766c1e..850f525 100644
--- a/js/jvon-interpret.js
+++ b/js/jvon-interpret.js
@@ -678,7 +678,7 @@ document.addEventListener('DOMContentLoaded', function () {
         var syntax = $scope.check_syntax(value);
 		var sqr;
         if (syntax.type == "blank") {
-            if ($scope.ac == "") {
+            if (typeof $scope.ac != 'number') {
                 alert($scope.strings.error_ac);
                 $scope.stop_code();
             }