fix underflow on input clipboard allow state

2 files changed, 4 insertions, 1 deletions

diff --git a/source/core/StarLua.cpp b/source/core/StarLua.cpp
index 91aebab..201f238 100644
--- a/source/core/StarLua.cpp
+++ b/source/core/StarLua.cpp
@@ -125,7 +125,9 @@ LuaTable LuaContext::createTable() {
 LuaNullEnforcer::LuaNullEnforcer(LuaEngine& engine)
   : m_engine(&engine) { ++m_engine->m_nullTerminated; };
 
-LuaNullEnforcer::~LuaNullEnforcer() { --m_engine->m_nullTerminated; };
+LuaNullEnforcer::LuaNullEnforcer(LuaNullEnforcer&& other) { m_engine = take(other.m_engine); };
+
+LuaNullEnforcer::~LuaNullEnforcer() { if (m_engine) --m_engine->m_nullTerminated; };
 
 LuaValue LuaConverter<Json>::from(LuaEngine& engine, Json const& v) {
   if (v.isType(Json::Type::Null)) {
diff --git a/source/core/StarLua.hpp b/source/core/StarLua.hpp
index fa777c2..1f0dc43 100644
--- a/source/core/StarLua.hpp
+++ b/source/core/StarLua.hpp
@@ -414,6 +414,7 @@ struct LuaNullTermWrapper : T {
 class LuaNullEnforcer {
 public:
   LuaNullEnforcer(LuaEngine& engine);
+  LuaNullEnforcer(LuaNullEnforcer&&);
   ~LuaNullEnforcer();
 private:
   LuaEngine* m_engine;