From 9e6ae0edc139c2c8a741c7127f4abf8ef2008985 Mon Sep 17 00:00:00 2001
From: Enno Rehling <enno.rehling@gmail.com>
Date: Wed, 9 May 2018 07:14:56 +0200
Subject: [PATCH] make str_strdup more forgiving

---
 src/util/strings.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/util/strings.c b/src/util/strings.c
index 81fdc3713..ab85328ab 100644
--- a/src/util/strings.c
+++ b/src/util/strings.c
@@ -218,6 +218,7 @@ unsigned int wang_hash(unsigned int a)
 }
 
 char *str_strdup(const char *s) {
+    if (s == NULL) return NULL;
 #ifdef HAVE_STRDUP
     return strdup(s);
 #elif defined(_MSC_VER)