0001-Fix-handling-of-NULL-pointers.patch

From 1adc34da2e3f7d3a5c8cb600d5d62cd018f7ca65 Mon Sep 17 00:00:00 2001
From: Ryan Curtin <ryan@ratml.org>
Date: Sun, 9 Aug 2020 21:46:05 -0400
Subject: [PATCH 1/3] Fix handling of NULL pointers.

---
 src/mlpack/core/cereal/pointer_wrapper.hpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/mlpack/core/cereal/pointer_wrapper.hpp b/src/mlpack/core/cereal/pointer_wrapper.hpp
index 3b3f228d6..36a657940 100644
--- a/src/mlpack/core/cereal/pointer_wrapper.hpp
+++ b/src/mlpack/core/cereal/pointer_wrapper.hpp
@@ -49,7 +49,9 @@ class pointer_wrapper
   template<class Archive>
   void save(Archive& ar, const unsigned int /*version*/) const
   {
-    std::unique_ptr<T> smartPointer = std::make_unique<T>(*this->localPointer);
+    std::unique_ptr<T> smartPointer;
+    if (this->localPointer != NULL)
+      smartPointer = std::make_unique<T>(std::move(*this->localPointer));
     ar(CEREAL_NVP(smartPointer));
     localPointer = smartPointer.release();
   }
-- 
2.28.0.rc1

Thanks 👍