1 files changed, 2 insertions, 1 deletions

diff --git a/sshkey.c b/sshkey.c
index 1571e3d93..1ac32a0ec 100644
--- a/sshkey.c
+++ b/sshkey.c
@@ -154,6 +154,7 @@ static const struct keytype keytypes[] = {
             KEY_ECDSA_SK_CERT, NID_X9_62_prime256v1, 1, 0 },
 # endif /* OPENSSL_HAS_ECC */
 #endif /* WITH_OPENSSL */
+        { "null", "null", NULL, KEY_NULL, 0, 0, 0 },
         { NULL, NULL, NULL, -1, -1, 0, 0 }
 };
 
@@ -255,7 +256,7 @@ sshkey_alg_list(int certs_only, int plain_only, int include_sigonly, char sep)
         const struct keytype *kt;
 
         for (kt = keytypes; kt->type != -1; kt++) {
-                if (kt->name == NULL)
+                if (kt->name == NULL || kt->type == KEY_NULL)
                         continue;
                 if (!include_sigonly && kt->sigonly)
                         continue;