diff --git a/fastapi_sqlalchemy_toolkit/model_manager.py b/fastapi_sqlalchemy_toolkit/model_manager.py
index 744dcd3..c812f4a 100644
--- a/fastapi_sqlalchemy_toolkit/model_manager.py
+++ b/fastapi_sqlalchemy_toolkit/model_manager.py
@@ -846,7 +846,8 @@ async def validate_unique_constraints(
         for unique_constraint in self.unique_constraints:
             query = {}
             for field in unique_constraint:
-                query[field] = in_obj[field]
+                if in_obj[field] is not None:
+                    query[field] = in_obj[field]
             object_exists = await self.exists(
                 session, **query, id=FieldFilter(in_obj.get("id"), operator="__ne__")
             )
@@ -871,7 +872,7 @@ async def validate_unique_fields(
         Проверить соблюдение уникальности полей.
         """
         for column in self.model.__table__.columns._all_columns:
-            if column.unique and column.name in in_obj:
+            if column.unique and column.name in in_obj and in_obj[column.name] is not None:
                 if db_obj and getattr(db_obj, column.name) == in_obj[column.name]:
                     continue
                 attrs_to_check = {column.name: in_obj[column.name]}
diff --git a/pyproject.toml b/pyproject.toml
index 71d0d66..4181c6f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -24,4 +24,4 @@ dependencies = [
 ]
 
 [project.urls]
-"Homepage" = "https://github.com/e-kondr01/fastapi-sqlalchemy-toolkit"
\ No newline at end of file
+"Homepage" = "https://github.com/e-kondr01/fastapi-sqlalchemy-toolkit"