diff --git a/src/scripts/controllers/new.js b/src/scripts/controllers/new.js
index 66c0f39..7584dfb 100644
--- a/src/scripts/controllers/new.js
+++ b/src/scripts/controllers/new.js
@@ -10,7 +10,9 @@
             availableOptions: (function () {
                 var keys = aria2SettingService.getNewTaskOptionKeys();
 
-                return aria2SettingService.getSpecifiedOptions(keys);
+                return aria2SettingService.getSpecifiedOptions(keys, {
+                    disableRequired: true
+                });
             })(),
             globalOptions: null,
             options: {},
diff --git a/src/scripts/controllers/task-detail.js b/src/scripts/controllers/task-detail.js
index 41837be..6f1a0bf 100644
--- a/src/scripts/controllers/task-detail.js
+++ b/src/scripts/controllers/task-detail.js
@@ -9,11 +9,9 @@
         var getAvailableOptions = function (status, isBittorrent) {
             var keys = aria2SettingService.getAvailableTaskOptionKeys(status, isBittorrent);
 
-            if (!keys) {
-                return;
-            }
-
-            return aria2SettingService.getSpecifiedOptions(keys);
+            return aria2SettingService.getSpecifiedOptions(keys, {
+                disableRequired: true
+            });
         };
 
         var processTask = function (task) {
diff --git a/src/scripts/directives/setting.js b/src/scripts/directives/setting.js
index 5083379..fe6dd40 100644
--- a/src/scripts/directives/setting.js
+++ b/src/scripts/directives/setting.js
@@ -170,17 +170,17 @@
                         return;
                     }
 
-                    if (scope.option.type === 'integer' && !/^-?\d+$/.test(optionValue)) {
+                    if (optionValue !== '' && scope.option.type === 'integer' && !/^-?\d+$/.test(optionValue)) {
                         scope.optionStatus.setError('Input number is invalid!');
                         return;
                     }
 
-                    if (scope.option.type === 'float' && !/^-?(\d*\.)?\d+$/.test(optionValue)) {
+                    if (optionValue !== '' && scope.option.type === 'float' && !/^-?(\d*\.)?\d+$/.test(optionValue)) {
                         scope.optionStatus.setError('Input number is invalid!');
                         return;
                     }
 
-                    if ((scope.option.type === 'integer' || scope.option.type === 'float') && (angular.isDefined(scope.option.min) || angular.isDefined(scope.option.max))) {
+                    if (optionValue !== '' && (scope.option.type === 'integer' || scope.option.type === 'float') && (angular.isDefined(scope.option.min) || angular.isDefined(scope.option.max))) {
                         var number = optionValue;
 
                         if (scope.option.type === 'integer') {
@@ -200,7 +200,7 @@
                         }
                     }
 
-                    if (angular.isDefined(scope.option.pattern) && !(new RegExp(scope.option.pattern).test(optionValue))) {
+                    if (optionValue !== '' && angular.isDefined(scope.option.pattern) && !(new RegExp(scope.option.pattern).test(optionValue))) {
                         scope.optionStatus.setError('Input value is invalid!');
                         return;
                     }
diff --git a/src/scripts/services/aria2SettingService.js b/src/scripts/services/aria2SettingService.js
index 4510456..be81d62 100644
--- a/src/scripts/services/aria2SettingService.js
+++ b/src/scripts/services/aria2SettingService.js
@@ -68,7 +68,7 @@
 
                 return availableOptions;
             },
-            getNewTaskOptionKeys: function (isBittorrent) {
+            getNewTaskOptionKeys: function () {
                 var allOptions = aria2TaskAvailableOptions.taskOptions;
                 var availableOptions = [];
 
@@ -92,9 +92,13 @@
 
                 return availableOptions;
             },
-            getSpecifiedOptions: function (keys) {
+            getSpecifiedOptions: function (keys, extendSettings) {
                 var options = [];
 
+                if (!keys) {
+                    return options;
+                }
+
                 for (var i = 0; i < keys.length; i++) {
                     var key = keys[i];
                     var readonly = false;
@@ -132,6 +136,10 @@
                         option.readonly = true;
                     }
 
+                    if (extendSettings && extendSettings.disableRequired) {
+                        option.required = false;
+                    }
+
                     if (option.options) {
                         var availableOptions = [];