diff --git a/views/votes_edit.erb b/views/votes_edit.erb
index b57d28b..e7fa5f6 100644
--- a/views/votes_edit.erb
+++ b/views/votes_edit.erb
@@ -57,7 +57,12 @@
 <h3><%= _("Actions for organizers") %></h2>
 
 <form action="/votes/<%= @vote.secure_id %>/open" method="post">
+  <% if @vote.candidates.length < 2 %>
+  <button type="submit" disabled><%= _("Open vote to participants") %></button>
+  <p><%= _("Add at least 2 candidates before opening the vote to participants.") %></p>
+  <% else %>
   <button type="submit"><%= _("Open vote to participants") %></button>
+  <% end %>
 </form>
 <form action="/votes/<%= @vote.secure_id %>/delete" method="post">
   <button type="submit"><%= _("Delete vote") %></button>
diff --git a/vote.rb b/vote.rb
index 71f7f01..ce08320 100644
--- a/vote.rb
+++ b/vote.rb
@@ -200,8 +200,10 @@ post '/votes/:id/open' do
   find_vote
   require_organizer
   require_draft_vote
-  @vote.state = 'open'
-  @vote.save
+  if not @vote.candidates.length < 2
+    @vote.state = 'open'
+    @vote.save
+  end
   redirect '/votes/' + @vote.secure_id
 end