diff --git a/app/models/concerns/fluentd/setting/plugin_config.rb b/app/models/concerns/fluentd/setting/plugin_config.rb
index c2814bb..e52cfa0 100644
--- a/app/models/concerns/fluentd/setting/plugin_config.rb
+++ b/app/models/concerns/fluentd/setting/plugin_config.rb
@@ -45,7 +45,13 @@ class Fluentd
         elements = []
         sections.to_h.each do |key, section_params|
           if %w(parse format buffer storage).include?(key)
-            section_params["0"] = { "@type" => self.attributes["#{key}_type"] }.merge(section_params["0"])
+            if section_params && section_params.key?("0")
+              section_params["0"] = { "@type" => self.attributes["#{key}_type"] }.merge(section_params["0"])
+            else
+              section_params = {
+                "0" => { "@type" => self.attributes["#{key}_type"] }
+              }
+            end
           end
           next if section_params.blank?
           section_params.each do |index, _section_params|
diff --git a/app/models/concerns/fluentd/setting/plugin_parameter.rb b/app/models/concerns/fluentd/setting/plugin_parameter.rb
index 62367fd..8e2a354 100644
--- a/app/models/concerns/fluentd/setting/plugin_parameter.rb
+++ b/app/models/concerns/fluentd/setting/plugin_parameter.rb
@@ -38,19 +38,19 @@ class Fluentd
       end
 
       def have_buffer_section?
-        self.class._sections.key?(:buffer)
+        self.class.have_buffer_section?
       end
 
       def have_storage_section?
-        self.class._sections.key?(:storage)
+        self.class.have_storage_section?
       end
 
       def have_parse_section?
-        self.class._sections.key?(:parse)
+        self.class.have_parse_section?
       end
 
       def have_format_section?
-        self.class._sections.key?(:format)
+        self.class.have_format_section?
       end
 
       def create_buffer
@@ -99,12 +99,34 @@ class Fluentd
           self._list[name]
         end
 
+        def have_buffer_section?
+          self._sections.key?(:buffer)
+        end
+
+        def have_storage_section?
+          self._sections.key?(:storage)
+        end
+
+        def have_parse_section?
+          self._sections.key?(:parse)
+        end
+
+        def have_format_section?
+          self._sections.key?(:format)
+        end
+
         def permit_params
           self.new # init
           keys = self._types.keys
           self._sections.each do |key, section|
             keys << _permit_section(key, section)
           end
+
+          keys << :buffer_type if have_buffer_section?
+          keys << :storage_type if have_storage_section?
+          keys << :parse_type if have_parse_section?
+          keys << :format_type if have_format_section?
+
           keys
         end
 
diff --git a/app/views/shared/settings/_form.html.haml b/app/views/shared/settings/_form.html.haml
index 99c3dde..8ab6274 100644
--- a/app/views/shared/settings/_form.html.haml
+++ b/app/views/shared/settings/_form.html.haml
@@ -5,7 +5,7 @@
 
 #plugin-setting
   - # NOTE: plugin_setting_form_action_url is defined at SettingConcern
-  = form_with(model: @setting, scope: :setting, url: plugin_setting_form_action_url(@fluentd), class: "ignore-rails-error-div", builder: FluentdFormBuilder) do |form|
+  = form_with(model: @setting, scope: :setting, url: plugin_setting_form_action_url(@fluentd), local: true, class: "ignore-rails-error-div", builder: FluentdFormBuilder) do |form|
     - @setting.common_options.each do |key|
       = form.field(key)