diff --git a/margin_app/app/alembic/versions/2025-03-05_added_lazy_selection_for_user_and_.py b/margin_app/app/alembic/versions/2025-03-05_added_lazy_selection_for_user_and_.py
deleted file mode 100644
index 9811a4b4..00000000
--- a/margin_app/app/alembic/versions/2025-03-05_added_lazy_selection_for_user_and_.py
+++ /dev/null
@@ -1,30 +0,0 @@
-"""added lazy selection for user and deposits
-
-Revision ID: 04844aee175f
-Revises: fe041c2f01ee
-Create Date: 2025-03-05 19:14:50.050535
-
-"""
-from typing import Sequence, Union
-
-from alembic import op
-import sqlalchemy as sa
-
-
-# revision identifiers, used by Alembic.
-revision: str = '04844aee175f'
-down_revision: Union[str, None] = 'fe041c2f01ee'
-branch_labels: Union[str, Sequence[str], None] = None
-depends_on: Union[str, Sequence[str], None] = None
-
-
-def upgrade() -> None:
-    # ### commands auto generated by Alembic - please adjust! ###
-    pass
-    # ### end Alembic commands ###
-
-
-def downgrade() -> None:
-    # ### commands auto generated by Alembic - please adjust! ###
-    pass
-    # ### end Alembic commands ###
diff --git a/margin_app/app/api/user.py b/margin_app/app/api/user.py
index 5f1c3565..5b0e358b 100644
--- a/margin_app/app/api/user.py
+++ b/margin_app/app/api/user.py
@@ -33,7 +33,8 @@ async def create_user(user: UserCreate)-> UserResponse:
     user_db = await user_crud.get_object_by_field(field="wallet_id", value=user.wallet_id)
 
     if user_db:
-        raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST, detail="User with such wallet_id laready exist.")
+        raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST,
+                            detail="User with such wallet_id laready exist.")
 
     try:
         user = await user_crud.create_user(user.wallet_id)
diff --git a/margin_app/app/crud/base.py b/margin_app/app/crud/base.py
index 8cb4fa92..a1fd2ed9 100644
--- a/margin_app/app/crud/base.py
+++ b/margin_app/app/crud/base.py
@@ -107,7 +107,7 @@ async def get_object_by_field(
         """
         async with self.session() as db:
             result = await db.execute(select(model).where(getattr(model, field) == value))
-            return result.scalar_one()
+            return result.scalar_one_or_none()
 
     async def delete_object_by_id(
         self, model: Type[ModelType] = None, obj_id: uuid = None