diff --git a/module/os/linux/zfs/vdev_disk.c b/module/os/linux/zfs/vdev_disk.c
index ed0e7a173195..328e47f522f6 100644
--- a/module/os/linux/zfs/vdev_disk.c
+++ b/module/os/linux/zfs/vdev_disk.c
@@ -530,7 +530,7 @@ vdev_bio_associate_blkg(struct bio *bio)
 	ASSERT3P(q, !=, NULL);
 	ASSERT3P(bio->bi_blkg, ==, NULL);
 
-	if (blkg_tryget(q->root_blkg))
+	if (q->root_blkg && blkg_tryget(q->root_blkg))
 		bio->bi_blkg = q->root_blkg;
 }
 #define	bio_associate_blkg vdev_bio_associate_blkg