From 91bf33f459eee9877cf722f245f6f20d5d128280 Mon Sep 17 00:00:00 2001
From: Aaron Gokaslan <skylion.aaron@gmail.com>
Date: Tue, 15 Feb 2022 11:30:06 -0500
Subject: [PATCH] guard if m_type is null

---
 include/pybind11/pytypes.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/pybind11/pytypes.h b/include/pybind11/pytypes.h
index a4ccb3741..fec563208 100644
--- a/include/pybind11/pytypes.h
+++ b/include/pybind11/pytypes.h
@@ -397,7 +397,7 @@ public:
     inline ~error_already_set() override;
 
     const char *what() const noexcept override {
-        if (m_lazy_what.empty()) {
+        if (m_lazy_what.empty() && m_type) {
             try {
                 m_lazy_what = detail::error_string(m_type.ptr(), m_value.ptr(), m_trace.ptr());
             } catch (...) {