diff --git a/mm/slab_common.c b/mm/slab_common.c
index 4d3c2e76d1ba5..39e382acb0b86 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -850,7 +850,8 @@ static void flush_memcg_workqueue(struct kmem_cache *s)
 	 * deactivates the memcg kmem_caches through workqueue. Make sure all
 	 * previous workitems on workqueue are processed.
 	 */
-	flush_workqueue(memcg_kmem_cache_wq);
+	if (likely(memcg_kmem_cache_wq))
+		flush_workqueue(memcg_kmem_cache_wq);
 }
 #else
 static inline int shutdown_memcg_caches(struct kmem_cache *s)