From 5ae9015c82de6f3b5b28f13c581894a770f651be Mon Sep 17 00:00:00 2001
From: Noisyfox <timemanager.rick@gmail.com>
Date: Sun, 27 Sep 2026 03:52:29 +0800
Subject: [PATCH] Fix rare crash due to invalid pointer when vector::resize
 reallocate underlying memory (#15877)

---
 src/libslic3r/Config.hpp | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/src/libslic3r/Config.hpp b/src/libslic3r/Config.hpp
index 6d23ec3770..52b16f9458 100644
--- a/src/libslic3r/Config.hpp
+++ b/src/libslic3r/Config.hpp
@@ -697,7 +697,8 @@ public:
                 }
             } else {
                 // Resize by duplicating the last value.
-                this->values.resize(n, this->values./*back*/front());
+                T v = this->values./*back*/front();
+                this->values.resize(n, v);
             }
         }
     }
@@ -772,8 +773,10 @@ public:
 
         if (this->values.empty())
             this->values.resize(rhs_vec->size());
-        else
-            this->values.resize(rhs_vec->size(), this->values.front());
+        else {
+            T v = this->values.front();
+            this->values.resize(rhs_vec->size(), v);
+        }
 
         assert(default_index.size() == rhs_vec->size());