From f5d9ced33c7a3cbc56764cface72c181c7f02b3d Mon Sep 17 00:00:00 2001
From: Nicolas Williams <nico@twosigma.com>
Date: Tue, 2 Mar 2021 21:12:02 -0600
Subject: [PATCH] asn1: Fix broken printing

---
 lib/asn1/template.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/asn1/template.c b/lib/asn1/template.c
index 0c3747635..818a200e8 100644
--- a/lib/asn1/template.c
+++ b/lib/asn1/template.c
@@ -2452,6 +2452,9 @@ _asn1_print(const struct asn1_template *t,
 
     tnames = tbase + nelements - nnames + 1;
 
+    if (!r)
+        r = rk_strpoolprintf(r, "%s", "");
+
     if (nnames)
         r = rk_strpoolprintf(r, "%s{\"_type\":\"%s\"",
                              indents ? indents : "",