diff --git a/plinth/modules/miniflux/views.py b/plinth/modules/miniflux/views.py
index 68d1160d1..ca0408cf0 100644
--- a/plinth/modules/miniflux/views.py
+++ b/plinth/modules/miniflux/views.py
@@ -51,7 +51,7 @@ class CreateAdminUserView(SuccessMessageMixin, FormView):
             messages.error(
                 self.request,
                 _('An error occurred while creating the user: {error}.').
-                format(error=error))
+                format(error=str(error).strip()))
 
         return super().form_valid(form)