diff --git a/apps/participation/views.py b/apps/participation/views.py
index afafbc7..235441f 100644
--- a/apps/participation/views.py
+++ b/apps/participation/views.py
@@ -391,7 +391,7 @@ class TeamAuthorizationsView(LoginRequiredMixin, DetailView):
                          _("Parental authorization of {participant}.{ext}")
                          .format(participant=str(participant), ext=ext))
 
-            if participant.health_sheet:
+            if isinstance(participant, StudentRegistration) and participant.health_sheet:
                 mime_type = magic.from_file("media/" + participant.health_sheet.name)
                 ext = mime_type.split("/")[1].replace("jpeg", "jpg")
                 zf.write("media/" + participant.health_sheet.name,