diff --git a/app/views/admin/books/_form.html.erb b/app/views/admin/books/_form.html.erb
index ee73e4a..f8bcb64 100644
--- a/app/views/admin/books/_form.html.erb
+++ b/app/views/admin/books/_form.html.erb
@@ -39,7 +39,7 @@
         <label class="control-label muted"><%= t("personal_plugins.author") %></label>
         <div class="controls">
           <%= @member.name rescue ''%>
-          <%= f.hidden_field :member_profile_id, :value => @member.id %>
+          <%= f.hidden_field :member_profile_id, :value => @member.id if !@member.nil? %>
         </div>
       </div>