diff --git a/drivers/md/dm-cache-target.c b/drivers/md/dm-cache-target.c
index 935ab79b1d0c..ae1edffd14ea 100644
--- a/drivers/md/dm-cache-target.c
+++ b/drivers/md/dm-cache-target.c
@@ -1462,8 +1462,10 @@ static void invalidate_complete(struct dm_cache_migration *mg, bool success)
 	struct cache *cache = mg->cache;
 
 	bio_list_init(&bios);
-	if (dm_cell_unlock_v2(cache->prison, mg->cell, &bios))
-		free_prison_cell(cache, mg->cell);
+	if (mg->cell) {
+		if (dm_cell_unlock_v2(cache->prison, mg->cell, &bios))
+			free_prison_cell(cache, mg->cell);
+	}
 
 	if (!success && mg->overwrite_bio)
 		bio_io_error(mg->overwrite_bio);