diff --git a/fs/nfsd/nfs4callback.c b/fs/nfsd/nfs4callback.c
index bd79fc4934f0f30c069f4be351676df06f1ff522..431598c11fcf8b7751756d463038446a30c3560a 100644
--- a/fs/nfsd/nfs4callback.c
+++ b/fs/nfsd/nfs4callback.c
@@ -915,7 +915,7 @@ static int setup_callback_client(struct nfs4_client *clp, struct nfs4_cb_conn *c
 		args.authflavor = clp->cl_cred.cr_flavor;
 		clp->cl_cb_ident = conn->cb_ident;
 	} else {
-		if (!conn->cb_xprt)
+		if (!conn->cb_xprt || !ses)
 			return -EINVAL;
 		clp->cl_cb_session = ses;
 		args.bc_xprt = conn->cb_xprt;