diff --git a/app/models/project.rb b/app/models/project.rb
index d1c8af3..37b760a 100644
--- a/app/models/project.rb
+++ b/app/models/project.rb
@@ -66,6 +66,7 @@ class Project
       if (self.fields[t].type.to_s == "String" rescue false)
         fields_to_remove << t if (datas.where(t.to_sym.ne => nil).or(t.to_sym.ne => "").count == 0 rescue false)
       else
+        t = "period_start_date" if t == "period"
         fields_to_remove << t if (datas.where(t.to_sym.ne => nil).count == 0 rescue false)
       end
       pd_title <<  {