diff --git a/mm/swap_cgroup.c b/mm/swap_cgroup.c
index de779fed8c21..95c38e54dd58 100644
--- a/mm/swap_cgroup.c
+++ b/mm/swap_cgroup.c
@@ -124,6 +124,8 @@ unsigned short lookup_swap_cgroup_id(swp_entry_t ent)
 		return 0;
 
 	ctrl = &swap_cgroup_ctrl[swp_type(ent)];
+	if (unlikely(!ctrl->map))
+		return 0;
 	return __swap_cgroup_id_lookup(ctrl->map, swp_offset(ent));
 }