--- crypto/openssl/ssl/t1_lib.c.orig
+++ crypto/openssl/ssl/t1_lib.c
@@ -2099,7 +2099,7 @@
         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;