diff --git a/classquiz/db/models.py b/classquiz/db/models.py
index 1a0709a..2a9902f 100644
--- a/classquiz/db/models.py
+++ b/classquiz/db/models.py
@@ -141,7 +141,7 @@ class QuizQuestion(BaseModel):
     def answers_not_none_if_abcd_type(cls, v, values):
         if values["type"] == QuizQuestionType.ABCD and not isinstance(v[0], ABCDQuizAnswer):
             raise ValueError("Answers can't be none if type is ABCD")
-        if values["type"] == QuizQuestionType.RANGE and not isinstance(v[0], RangeQuizAnswer):
+        if values["type"] == QuizQuestionType.RANGE and not isinstance(v, RangeQuizAnswer):
             raise ValueError("Answer must be from type RangeQuizAnswer if type is RANGE")
         if values["type"] == QuizQuestionType.VOTING and not isinstance(v[0], VotingQuizAnswer):
             raise ValueError("Answer must be from type VotingQuizAnswer if type is VOTING")
@@ -149,7 +149,7 @@ class QuizQuestion(BaseModel):
             raise ValueError("Answer must be from type TextQuizAnswer if type is TEXT")
         if values["type"] == QuizQuestionType.ORDER and not isinstance(v[0], VotingQuizAnswer):
             raise ValueError("Answer must be from type VotingQuizAnswer if type is ORDER")
-        if values["type"] == QuizQuestionType.SLIDE and not isinstance(v[0], str):
+        if values["type"] == QuizQuestionType.SLIDE and not isinstance(v, str):
             raise ValueError("Answer must be from type SlideElement if type is SLIDE")
         if values["type"] == QuizQuestionType.CHECK and not isinstance(v[0], ABCDQuizAnswer):
             raise ValueError("Answers can't be none if type is CHECK")