diff --git a/portfolios/views.py b/portfolios/views.py
index a7a2e08..00d33ed 100644
--- a/portfolios/views.py
+++ b/portfolios/views.py
@@ -77,8 +77,11 @@ class PortfolioChangeState(APIView):
         portfolio = get_object_or_404(Portfolio, pk=pk)
         user = request.user
         action_type = request.query_params.get('type')
-        if PortfolioBeforeRelCheckService.check_user_portfolio_rel(action_type, portfolio, user):
-            return Response({"message": "already done"}, status=status.HTTP_400_BAD_REQUEST)
+        try:
+            if PortfolioBeforeRelCheckService.check_user_portfolio_rel(action_type, portfolio, user):
+                return Response({"message": "already done"}, status=status.HTTP_400_BAD_REQUEST)
+        except ValueError as e:
+            return Response({'message': str(e)}, status=status.HTTP_400_BAD_REQUEST)
         return self._handle_action(action_type, portfolio, user, add=True)
 
     @transaction.atomic
@@ -86,8 +89,11 @@ class PortfolioChangeState(APIView):
         portfolio = get_object_or_404(Portfolio, pk=pk)
         user = request.user
         action_type = request.query_params.get('type')
-        if not PortfolioBeforeRelCheckService.check_user_portfolio_rel(action_type, portfolio, user):
-            return Response({"message": "never done before"}, status=status.HTTP_400_BAD_REQUEST)
+        try:
+            if not PortfolioBeforeRelCheckService.check_user_portfolio_rel(action_type, portfolio, user):
+                return Response({"message": "never done before"}, status=status.HTTP_400_BAD_REQUEST)
+        except ValueError as e:
+            return Response({'message': str(e)}, status=status.HTTP_400_BAD_REQUEST)
         return self._handle_action(action_type, portfolio, user, add=False)
 
     def _handle_action(self, action_type, portfolio, user, add=True):