diff --git a/fastapi_users/db/sqlalchemy.py b/fastapi_users/db/sqlalchemy.py
index 4d376ef6..c8eabda0 100644
--- a/fastapi_users/db/sqlalchemy.py
+++ b/fastapi_users/db/sqlalchemy.py
@@ -13,10 +13,10 @@ class SQLAlchemyBaseUserTable:
     __tablename__ = "user"
 
     id = Column(String, primary_key=True)
-    email = Column(String, unique=True, index=True)
-    hashed_password = Column(String)
-    is_active = Column(Boolean, default=True)
-    is_superuser = Column(Boolean, default=False)
+    email = Column(String, unique=True, index=True, nullable=False)
+    hashed_password = Column(String, nullable=False)
+    is_active = Column(Boolean, default=True, nullable=False)
+    is_superuser = Column(Boolean, default=False, nullable=False)
 
 
 class SQLAlchemyUserDatabase(BaseUserDatabase):
diff --git a/tests/test_db_sqlalchemy.py b/tests/test_db_sqlalchemy.py
index 81f1fbbd..d6f36bf7 100644
--- a/tests/test_db_sqlalchemy.py
+++ b/tests/test_db_sqlalchemy.py
@@ -71,6 +71,14 @@ async def test_queries(sqlalchemy_user_db):
     with pytest.raises(sqlite3.IntegrityError):
         await sqlalchemy_user_db.create(user)
 
+    # Exception when inserting non-nullable fields
+    with pytest.raises(sqlite3.IntegrityError):
+        wrong_user = BaseUserDB(
+            id="222",
+            hashed_password="aaa"
+        )
+        await sqlalchemy_user_db.create(wrong_user)
+
     # Unknown user
     unknown_user = await sqlalchemy_user_db.get_by_email("galahad@camelot.bt")
     assert unknown_user is None