diff --git a/mm/slab.h b/mm/slab.h
index 620ceeddbe1ad74cfa5fb7bc5e2fc2d13f7e3191..a535033f7e9a153dfa7252dbb0d74f7be5ae4e58 100644
--- a/mm/slab.h
+++ b/mm/slab.h
@@ -162,6 +162,8 @@ static inline const char *cache_name(struct kmem_cache *s)
 
 static inline struct kmem_cache *cache_from_memcg(struct kmem_cache *s, int idx)
 {
+	if (!s->memcg_params)
+		return NULL;
 	return s->memcg_params->memcg_caches[idx];
 }