From 8fa156efb67eec1a9c4f442b0f571174675cedd9 Mon Sep 17 00:00:00 2001
From: Julien Schueller <schueller@phimeca.com>
Date: Mon, 4 Jul 2022 13:23:06 +0200
Subject: [PATCH] options: nlopt_set_xtol_abs check xtol_abs

Closes #461
---
 src/api/options.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/api/options.c b/src/api/options.c
index 853a5d67..f2b4ac87 100644
--- a/src/api/options.c
+++ b/src/api/options.c
@@ -689,7 +689,7 @@ GETSET(stopval, double, stopval)
 GETSET(ftol_rel, double, ftol_rel) GETSET(ftol_abs, double, ftol_abs) GETSET(xtol_rel, double, xtol_rel)
  nlopt_result NLOPT_STDCALL nlopt_set_xtol_abs(nlopt_opt opt, const double *xtol_abs)
 {
-    if (opt) {
+    if (opt && xtol_abs) {
         nlopt_unset_errmsg(opt);
         if (!opt->xtol_abs && opt->n > 0) {
             opt->xtol_abs = (double *) calloc(opt->n, sizeof(double));