diff --git a/trytond/trytond/model/modelstorage.py b/trytond/trytond/model/modelstorage.py
index f90bcd62d9..0cf814540d 100644
--- a/trytond/trytond/model/modelstorage.py
+++ b/trytond/trytond/model/modelstorage.py
@@ -1207,7 +1207,9 @@ class ModelStorage(Model):
                     Relation = field.get_target()
                 elif field._type == 'reference':
                     value = getattr(record, field.name)
-                    Relation = value.__class__ if value else None
+                    Relation = (
+                        value.__class__ if isinstance(value, ModelStorage)
+                        else None)
                 else:
                     Relation = cls
                 return Relation
diff --git a/trytond/trytond/tests/test_field_reference.py b/trytond/trytond/tests/test_field_reference.py
index ac2b43fb32..5077bd1ea0 100644
--- a/trytond/trytond/tests/test_field_reference.py
+++ b/trytond/trytond/tests/test_field_reference.py
@@ -510,6 +510,28 @@ class FieldReferenceTestCase(unittest.TestCase):
                     }])
         self.assertEqual(reference.reference, None)
 
+    @with_transaction()
+    def test_domain_no_id_value(self):
+        "Test reference with domain and no id"
+        pool = Pool()
+        Reference = pool.get('test.reference_domainvalidation')
+
+        reference, = Reference.create([{
+                    'reference': 'test.reference.target,',
+                    }])
+        self.assertEqual(reference.reference, 'test.reference.target,')
+
+    @with_transaction()
+    def test_domain_negative_id_value(self):
+        "Test reference with domain and negative id"
+        pool = Pool()
+        Reference = pool.get('test.reference_domainvalidation')
+
+        reference, = Reference.create([{
+                    'reference': 'test.reference.target,-1',
+                    }])
+        self.assertEqual(reference.reference, 'test.reference.target,-1')
+
     @with_transaction()
     def test_domain_different_targets(self):
         "Test reference with domain and different targets"
@@ -544,6 +566,28 @@ class FieldReferenceTestCase(unittest.TestCase):
                     }])
         self.assertEqual(reference.reference, target)
 
+    @with_transaction()
+    def test_domain_pyson_no_id_value(self):
+        "Test reference with pyson domain and no id"
+        pool = Pool()
+        Reference = pool.get('test.reference_domainvalidation_pyson')
+
+        reference, = Reference.create([{
+                    'reference': 'test.reference.target,',
+                    }])
+        self.assertEqual(reference.reference, 'test.reference.target,')
+
+    @with_transaction()
+    def test_domain_pyson_negative_id_value(self):
+        "Test reference with pyson domain and negative id"
+        pool = Pool()
+        Reference = pool.get('test.reference_domainvalidation_pyson')
+
+        reference, = Reference.create([{
+                    'reference': 'test.reference.target,-1',
+                    }])
+        self.assertEqual(reference.reference, 'test.reference.target,-1')
+
     @with_transaction()
     def test_domain_pyson_different_targets(self):
         "Test reference with pyson domain and different targets"