From b8a8e38ceb5898191db2d61fdb4e89e878635fd2 Mon Sep 17 00:00:00 2001
From: harrierpigeon <college.joseph.robertson@gmail.com>
Date: Fri, 25 Sep 2026 01:54:17 -0500
Subject: [PATCH] G-code: no crossing-perimeter avoidance while travelling on a
 brim apron layer

Crossing-perimeter avoidance dereferenced the (null) layer while travelling on a brim
apron layer.
---
 src/libslic3r/GCode.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/libslic3r/GCode.cpp b/src/libslic3r/GCode.cpp
index 75b14e06bc..9947e40b8d 100644
--- a/src/libslic3r/GCode.cpp
+++ b/src/libslic3r/GCode.cpp
@@ -9427,6 +9427,7 @@ std::string GCode::travel_to(const Point& point, ExtrusionRole role, std::string
     // multi-hop travel path inside the configuration space
     if (m_config.reduce_crossing_wall
         && !m_avoid_crossing_perimeters.disabled_once()
+        && m_layer != nullptr   // A brim apron layer has no Layer to avoid crossing
         && m_writer->is_current_position_clear())
         //BBS: don't generate detour travel paths when current position is unclea
     {