diff --git a/app/models/project.rb b/app/models/project.rb
index aad320b..6a2ad02 100644
--- a/app/models/project.rb
+++ b/app/models/project.rb
@@ -187,7 +187,7 @@ class Project < ActiveRecord::Base
       if user.logged?
         user.projects_by_role.each do |role, projects|
           if role.allowed_to?(permission)
-            statement_by_role[role] = "#{Project.table_name}.id IN (#{projects.collect(&:id).join(',')})"
+            statement_by_role[role] = "#{Project.table_name}.id IN (#{projects.collect(&:id).join(',')})" unless projects.blank?
           end
         end
       end