diff --git a/crypto/openssl/ssl/t1_lib.c b/crypto/openssl/ssl/t1_lib.c
index a254fd5a0559..76b4baa38893 100644
--- a/crypto/openssl/ssl/t1_lib.c
+++ b/crypto/openssl/ssl/t1_lib.c
@@ -2130,7 +2130,7 @@ static int tls1_check_sig_alg(SSL *s, X509 *x, int default_nid)
         sigalg = use_pc_sigalgs
                  ? tls1_lookup_sigalg(s->s3->tmp.peer_cert_sigalgs[i])
                  : s->shared_sigalgs[i];
-        if (sig_nid == sigalg->sigandhash)
+        if (sigalg != NULL && sig_nid == sigalg->sigandhash)
             return 1;
     }
     return 0;