diff --git a/app/controllers/cardManager.py b/app/controllers/cardManager.py
index 10393c9..6eabb6a 100644
--- a/app/controllers/cardManager.py
+++ b/app/controllers/cardManager.py
@@ -5,7 +5,7 @@ from sqlmodel import Session, select
 from typing import List
 from sqlalchemy.exc import NoResultFound
 
-from ..model.models import Card, CardCreate
+from ..model.models import Card, CardCreate, GroupDB
 from ..services.database import engine, get_session, add_and_refresh
 from ..services.auth import auth_is_admin
 import uuid as gen_uuid
@@ -29,6 +29,12 @@ def register_card(cardInput: CardCreate):
 
 @card_router.post("/", response_model=Card)
 def add_card(cardInput: CardCreate, db: Session = Depends(get_session), admin: bool = Depends(auth_is_admin)):
+    try: assert db.exec(select(Card).where(Card.name == cardInput.name)).one_or_none() == None
+    except AssertionError:
+        raise HTTPException(status.HTTP_409_CONFLICT, detail="Name already used!")
+    try: assert db.exec(select(GroupDB).where(GroupDB.id == cardInput.group_id)).one_or_none() is not None
+    except AssertionError:
+        raise HTTPException(status.HTTP_404_NOT_FOUND, detail="GroupID not found!")
     card = register_card(cardInput)
     return add_and_refresh(db, card)
 
@@ -40,7 +46,7 @@ def del_card(*, db: Session = Depends(get_session), admin: bool = Depends(auth_i
         card = db.exec(select(Card).where(Card.key == key)).one()
     except NoResultFound:
         logger.info(f"The key:'{key}' was not found in db!")
-        raise HTTPException(status_code=500, detail="Key on card not found in DB. Please tell an admin about this. KEY={key}")
+        raise HTTPException(status.HTTP_500_INTERNAL_SERVER_ERROR, detail="Key on card not found in DB. Please tell an admin about this. KEY={key}")
     db.delete(card)
     db.commit()
     return {"message": "Card deleted successfully"}
diff --git a/app/controllers/userManager.py b/app/controllers/userManager.py
index 186e04a..22bfbb4 100644
--- a/app/controllers/userManager.py
+++ b/app/controllers/userManager.py
@@ -1,6 +1,6 @@
 import logging
 logger = logging.getLogger(__name__)
-from fastapi import APIRouter, HTTPException, Depends
+from fastapi import APIRouter, HTTPException, Depends, status
 from sqlmodel import Session, select
 from typing import List
 
@@ -13,6 +13,9 @@ user_router = APIRouter(tags=["Users"], prefix="/api/v1/users")
 @user_router.post("/", response_model=UserResponse)
 def create_user(*, db: Session = Depends(get_session), user: UserCreate, admin: bool = Depends(auth_is_admin)):
     hashed_password = {"passwordhash": get_password_hash(user.password)}
+    try: assert db.exec(select(UserDB).where(UserDB.name == user.name)).one_or_none() == None
+    except AssertionError:
+        raise HTTPException(status.HTTP_409_CONFLICT, detail="Name already used!")
     db_user = UserDB.model_validate(user, update=hashed_password)
     return add_and_refresh(db, db_user)