diff --git a/app/models/ordergroup.rb b/app/models/ordergroup.rb
index 5b9c6f19..dac10a9b 100644
--- a/app/models/ordergroup.rb
+++ b/app/models/ordergroup.rb
@@ -108,7 +108,7 @@ class Ordergroup < Group
 
   # Make sure, the name is uniq, add usefull message if uniq group is already deleted
   def uniqueness_of_name
-    id = new_record? ? '' : self.id
+    id = new_record? ? nil : self.id
     group = Ordergroup.with_deleted.where('groups.id != ? AND groups.name = ?', id, name).first
     if group.present?
       message = group.deleted? ? :taken_with_deleted : :taken
@@ -118,7 +118,7 @@ class Ordergroup < Group
 
   # Make sure, the name is uniq, add usefull message if uniq group is already deleted
   def uniqueness_of_name
-    id = new_record? ? '' : self.id
+    id = new_record? ? nil : self.id
     group = Ordergroup.where('groups.id != ? AND groups.name = ?', id, name).first
     if group.present?
       message = group.deleted? ? :taken_with_deleted : :taken
diff --git a/app/models/supplier.rb b/app/models/supplier.rb
index 557cd4e4..01f93d35 100644
--- a/app/models/supplier.rb
+++ b/app/models/supplier.rb
@@ -82,7 +82,7 @@ class Supplier < ActiveRecord::Base
 
   # Make sure, the name is uniq, add usefull message if uniq group is already deleted
   def uniqueness_of_name
-    id = new_record? ? '' : self.id
+    id = new_record? ? nil : self.id
     supplier = Supplier.where('suppliers.id != ? AND suppliers.name = ?', id, name).first
     if supplier.present?
       message = supplier.deleted? ? :taken_with_deleted : :taken