Bugfix: Fix js console error

  login.js?v=1.4_r033_v18:98 Uncaught TypeError: Cannot read property 'length' of undefined
    at HTMLDocument.<anonymous> (login.js?v=1.4_r033_v18:98)

functions/version.php

@@ -4,7 +4,7 @@ define("VERSION", "1.4");									//decimal release version e.g 1.32
 /* set latest version */
 define("VERSION_VISIBLE", "1.4");							//visible version in footer e.g 1.3.2
 /* set latest revision */
-define("REVISION", "033");									//increment on static content changes (js/css) or point releases to avoid caching issues
+define("REVISION", "034");									//increment on static content changes (js/css) or point releases to avoid caching issues
 /* set last possible upgrade */
 define("LAST_POSSIBLE", "1.19");								//minimum required version to be able to upgrade
 

js/login.js

@@ -95,13 +95,15 @@ $('form#login_2fs').submit(function() {
 
 /* Submit on keyup */
 $(document).keyup(function(e) {
-    var codevallength = $('form#login_2fs input#2fa_code').val().length
-    if(codevallength == 6) {
+    var codeval = $('form#login_2fs input#2fa_code').val();
+    if (codeval != null) {
+        if(codeval.length == 6) {
             submit_2fs (true);
         }
-    else if (codevallength > 0) {
+        else if (codeval.length > 0) {
             $('div#twofaCheck').fadeOut('fast');
         }
+    }
 });
 
 /*	submit IP request