From 0f8666ecdc98341c09b0a99205728e30b5bec49f Mon Sep 17 00:00:00 2001
From: Niels Lohmann <mail@nlohmann.me>
Date: Thu, 15 Jul 2021 13:03:20 +0200
Subject: [PATCH] :bug: fix leak for strings

---
 single_include/nlohmann/json.hpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/single_include/nlohmann/json.hpp b/single_include/nlohmann/json.hpp
index 601b28a06..219a6a480 100644
--- a/single_include/nlohmann/json.hpp
+++ b/single_include/nlohmann/json.hpp
@@ -4694,7 +4694,10 @@ template<typename BasicJsonType, typename CompatibleString,
          enable_if_t<std::is_constructible<typename BasicJsonType::string_t, CompatibleString>::value, int> = 0>
 void to_json(BasicJsonType& j, const CompatibleString& s)
 {
-    j.m_value.destroy(j.m_type);
+    if (!j.is_null())
+    {
+        j = nullptr;
+    }
     external_constructor<value_t::string>::construct(j, s);
 }