From 0dd7dfb48a7b4e5fc03b755d261225bcc1eb976a Mon Sep 17 00:00:00 2001
From: Matthias Koefferlein <matthias@klayout.de>
Date: Sat, 28 Sep 2024 17:53:26 +0200
Subject: [PATCH] Fixed issue #1874 (crash when copying a cell to another
 layout)

---
 src/db/db/dbClipboardData.cc | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/db/db/dbClipboardData.cc b/src/db/db/dbClipboardData.cc
index 453f6ae31..9c1b1ffeb 100644
--- a/src/db/db/dbClipboardData.cc
+++ b/src/db/db/dbClipboardData.cc
@@ -158,8 +158,10 @@ ClipboardData::do_insert (db::Layout &layout, const db::ICplxTrans *trans, db::C
 {
   //  identify the cells our target is eventually called from, including itself
   std::set<db::cell_index_type> callers;
-  cell->collect_caller_cells (callers);
-  callers.insert (cell->cell_index ());
+  if (cell) {
+    cell->collect_caller_cells (callers);
+    callers.insert (cell->cell_index ());
+  }
 
   std::vector <unsigned int> new_layers;
   PropertyMapper prop_id_map (&layout, &m_layout);