diff --git a/app/models/research.rb b/app/models/research.rb
index b502fc9..19add74 100644
--- a/app/models/research.rb
+++ b/app/models/research.rb
@@ -57,7 +57,11 @@ class Research
     pd_title = []
 
     fields_to_show.each do |t|
-      fields_to_remove << t if (datas.where(t.to_sym.ne => nil, t.to_sym.ne => "").count == 0 rescue false)
+      if (self.fields[t].type.to_s == "String" || self.fields[t].type.to_s == "Object" rescue false)
+        fields_to_remove << t if (datas.where(t.to_sym.ne => nil, t.to_sym.ne => "").count == 0 rescue false)
+      else
+        fields_to_remove << t if (datas.where(t.to_sym.ne => nil).count == 0 rescue false)
+      end
       pd_title <<  {
           "plugin_data_title" => I18n.t("personal_research.#{t}")
         } if !fields_to_remove.include?(t)