From 3a9148a3e000a595b5cb68ffa162f475a84abbec Mon Sep 17 00:00:00 2001
From: Bill Currie <bill@taniwha.org>
Date: Thu, 18 May 2023 20:53:04 +0900
Subject: [PATCH] [ruamoko] Return nil for %@ printf format

Fixes a segfault when attempting to print a nil object.
---
 libs/ruamoko/rua_obj.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libs/ruamoko/rua_obj.c b/libs/ruamoko/rua_obj.c
index 0e1a8ddb8..24fab22e9 100644
--- a/libs/ruamoko/rua_obj.c
+++ b/libs/ruamoko/rua_obj.c
@@ -1470,6 +1470,9 @@ rua_obj_set_error_handler (progs_t *pr, void *data)
 static const char *
 rua_at_handler (progs_t *pr, pr_ptr_t at_param, void *_probj)
 {
+	if (!at_param) {
+		return "nil";
+	}
 	probj_t    *probj = _probj;
 	pr_id_t    *obj = &G_STRUCT (pr, pr_id_t, at_param);
 	pr_class_t *class = &G_STRUCT (pr, pr_class_t, obj->class_pointer);