diff --git a/junior/views.py b/junior/views.py
index b53da2d..03f8ae7 100644
--- a/junior/views.py
+++ b/junior/views.py
@@ -206,7 +206,7 @@ class AddJuniorAPIView(viewsets.ModelViewSet):
         guardian = Guardian.objects.filter(user=self.request.user).first()
         if not junior:
             return none
-        if guardian.guardian_code in junior.guardian_code:
+        if junior.guardian_code and (guardian.guardian_code in junior.guardian_code):
             return False
         if type(junior.guardian_code) is list:
             junior.guardian_code.append(guardian.guardian_code)