diff --git a/amocrm/v2/fields.py b/amocrm/v2/fields.py
index 87ec0d0..6ddde1f 100644
--- a/amocrm/v2/fields.py
+++ b/amocrm/v2/fields.py
@@ -115,7 +115,7 @@ def _model(self):
 
     @property
     def _manager(self):
-        return self.__manager or self._model.objects
+        return self.__manager or self._model.objects if self._model else None
 
     def on_get(self, data):
         return self._manager.get(object_id=data)
@@ -131,7 +131,7 @@ def __init__(self, data, instance, model, manager=None, links=LinksInteraction()
         self._data = data
         self._model = model
         self._instance = instance
-        self._manager = manager or model.objects
+        self._manager = manager or model.objects if model else None
         self._links = links
 
     def __iter__(self):
diff --git a/tests/data/companies.py b/tests/data/companies.py
index 967fae6..c00079b 100644
--- a/tests/data/companies.py
+++ b/tests/data/companies.py
@@ -21,3 +21,27 @@
     "_links": {"self": {"href": "https://exmaple.amocrm.ru/api/v4/companies/1"}},
     "_embedded": {"tags": []},
 }
+
+DETAIL_INFO_2 = {
+    "id": 1,
+    "name": "АО Копыта и рыла",
+    "responsible_user_id": 504141,
+    "group_id": 0,
+    "created_by": 504141,
+    "updated_by": 504141,
+    "created_at": 1582117331,
+    "updated_at": 1586361223,
+    "closest_task_at": None,
+    "custom_fields_values": [
+        {
+            "field_id": 3,
+            "field_name": "Телефон",
+            "field_code": "PHONE",
+            "field_type": "multitext",
+            "values": [{"value": "123213", "enum_id": 1, "enum": "WORK"}],
+        }
+    ],
+    "account_id": 10,
+    "_links": {"self": {"href": "https://exmaple.amocrm.ru/api/v4/companies/1"}},
+    "_embedded": {"tags": []},
+}
\ No newline at end of file
diff --git a/tests/test_contacts.py b/tests/test_contacts.py
index b181268..b9847f1 100644
--- a/tests/test_contacts.py
+++ b/tests/test_contacts.py
@@ -2,7 +2,7 @@
 
 from amocrm.v2 import Contact, exceptions, filters
 
-from .data.companies import DETAIL_INFO as COMPANY_DETAIL_INFO
+from .data.companies import DETAIL_INFO as COMPANY_DETAIL_INFO, DETAIL_INFO_2
 from .data.contacts import (CREATE_DATA, DETAIL_INFO, LIST_PAGE_1, LIST_PAGE_2,
                             UPDATE)
 from .data.users import DETAIL_INFO as USER_DETAIL_INFO
@@ -75,3 +75,15 @@ def test_update(response_mock):
     contact.last_name = "e"
     contact.tags.add("tag")
     contact.save()
+
+
+def test_repr(response_mock):
+    response_mock.add("GET", "https://test.amocrm.ru/api/v4/contacts/3", match_querystring=False, json=DETAIL_INFO)
+    response_mock.add("GET",
+                      "https://test.amocrm.ru/api/v4/companies/1?with=contacts%2Ccustomers%2Cleads%2Ctags",
+                      match_querystring=False,
+                      json=DETAIL_INFO_2)
+    contact = Contact.objects.get(3)
+
+    representation = repr(contact)
+    assert representation