diff --git a/classquiz/routers/quiz.py b/classquiz/routers/quiz.py
index 16ad00e..ec63d8e 100644
--- a/classquiz/routers/quiz.py
+++ b/classquiz/routers/quiz.py
@@ -14,16 +14,17 @@ from classquiz.db.models import Quiz, QuizInput, User, PlayGame
 from classquiz.kahoot_importer.import_quiz import import_quiz
 
 settings = settings()
+imgur_regex = r"^https://i\.imgur\.com\/.{7}.(jpg|png|gif)$"
+server_regex = rf"^{settings.root_address}/api/v1/storage/download/.{36}--.{36}$"
 
 router = APIRouter()
 
 
 @router.post("/create")
 async def create_quiz_lol(quiz_input: QuizInput, user: User = Depends(get_current_user)):
-    imgur_regex = r"^https://i\.imgur\.com\/.{7}.(jpg|png|gif)$"
-    server_regex = rf"^{settings.root_address}/api/v1/storage/download/.{36}--.{36}$"
+
     for question in quiz_input.questions:
-        if question.image is not None:
+        if question.image is not "":
             if not re.match(imgur_regex, question.image) or not re.match(server_regex, question.image):
                 raise HTTPException(status_code=400, detail="image url is not valid")
     quiz = Quiz(**quiz_input.dict(), user_id=user.id, id=uuid.uuid4())
@@ -90,6 +91,10 @@ async def get_quiz_list(user: User = Depends(get_current_user)):
 
 @router.put("/update/{quiz_id}")
 async def update_quiz(quiz_id: str, quiz_input: QuizInput, user: User = Depends(get_current_user)):
+    for question in quiz_input.questions:
+        if question.image is not "":
+            if not re.match(imgur_regex, question.image) or not re.match(server_regex, question.image):
+                raise HTTPException(status_code=400, detail="image url is not valid")
     try:
         quiz_id = uuid.UUID(quiz_id)
     except ValueError: