diff --git a/app/controllers/seminars_controller.rb b/app/controllers/seminars_controller.rb
index d15b58d..9137d7a 100644
--- a/app/controllers/seminars_controller.rb
+++ b/app/controllers/seminars_controller.rb
@@ -533,23 +533,24 @@ class SeminarsController < ApplicationController
   def update
     @con = SeminarSignupContribute.find(params[:seminar_signup_contribute][:id])
     update_params = seminar_signup_contribute_params.merge('seminar_submission_values'=>params['seminar_submission_values'])
-    flag = true
     update_params.permit!
-    if update_params['seminar_submission_values']['0']['value'].class==String
-      value = update_params['seminar_submission_values']['0']['value']
-      if !value.to_s.blank?
-        flag = false
-      end
-    else
-      update_params['seminar_submission_values']['0']['value'].each do |key,value|
-      if !value.to_s.blank?
+    unless update_params['seminar_submission_values'].nil?
+      flag = true
+      if update_params['seminar_submission_values']['0']['value'].class==String
+        value = update_params['seminar_submission_values']['0']['value']
+        if !value.to_s.blank?
           flag = false
         end
+      else
+        update_params['seminar_submission_values']['0']['value'].each do |key,value|
+        if !value.to_s.blank?
+            flag = false
+          end
+        end
+      end
+      if flag
+        update_params['seminar_submission_values']['0']['value']['en'] = ' '
       end
-    end
-    
-    if flag
-      update_params['seminar_submission_values']['0']['value']['en'] = ' '
     end
     @con.update_attributes(update_params)
     if @con.save