From 43da0f7d9a1b8bb035f1fb2563d1b0962c977c6c Mon Sep 17 00:00:00 2001
From: Eyal Levin <edit.eyallevin@gmail.com>
Date: Sat, 18 Apr 2026 09:42:54 +0300
Subject: [PATCH] Fix crash when selecting or moving wipe tower (#13243)

---
 src/slic3r/GUI/Selection.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/slic3r/GUI/Selection.cpp b/src/slic3r/GUI/Selection.cpp
index 265c43b422..05b9ae5d35 100644
--- a/src/slic3r/GUI/Selection.cpp
+++ b/src/slic3r/GUI/Selection.cpp
@@ -600,7 +600,9 @@ void Selection::set_printable(bool printable)
 }
 
 bool Selection::get_auto_drop() const {
-    if (!m_valid)
+    // The wipe tower is not a ModelObject and has no per-instance auto_drop;
+    // return the default to avoid indexing m_model->objects with its synthetic id.
+    if (!m_valid || is_wipe_tower())
         return true;
 
     std::set<std::pair<int, int>> instances_idxs;