From 34ec644e2955b1108f9286ad250b6a79b27591f3 Mon Sep 17 00:00:00 2001
From: "zhimin.zeng" <zhimin.zeng@bambulab.com>
Date: Fri, 11 Apr 2025 09:48:57 +0800
Subject: [PATCH] FIX: crash when slicing(generate infill)

jira: STUDIO-11142
Change-Id: I2bc086d7259ad327534c57787e06242b7340295c
---
 src/libslic3r/Fill/FillRectilinear.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/libslic3r/Fill/FillRectilinear.cpp b/src/libslic3r/Fill/FillRectilinear.cpp
index 1abbfd12a..6473506e6 100644
--- a/src/libslic3r/Fill/FillRectilinear.cpp
+++ b/src/libslic3r/Fill/FillRectilinear.cpp
@@ -2192,6 +2192,8 @@ static void connect_monotonic_regions(std::vector<MonotonicRegion> &regions, con
 			    for (;;) {
 				    MapType key(rbegin, nullptr);
 				    auto it = std::lower_bound(map_intersection_to_region_start.begin(), map_intersection_to_region_start.end(), key);
+                    if (it == map_intersection_to_region_start.end() || it->first != key.first)
+                        break;
 				    assert(it != map_intersection_to_region_start.end() && it->first == key.first);
 				    it->second->left_neighbors.emplace_back(&region);
 				    SegmentIntersection *rnext = &vertical_run_top(vline_right, *rbegin);