From b004cc2dfd1ba58eb2094dad87cdb19179374894 Mon Sep 17 00:00:00 2001
From: Matthias Koefferlein <matthias@klayout.de>
Date: Mon, 20 Jul 2026 21:03:38 +0200
Subject: [PATCH] Fixing name update - layer index needs to be valid

---
 src/laybasic/laybasic/layLayerProperties.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/laybasic/laybasic/layLayerProperties.cc b/src/laybasic/laybasic/layLayerProperties.cc
index f40066c09..0e899efad 100644
--- a/src/laybasic/laybasic/layLayerProperties.cc
+++ b/src/laybasic/laybasic/layLayerProperties.cc
@@ -640,7 +640,7 @@ LayerProperties::do_realize (const LayoutViewBase *view) const
 
       }
 
-      if (m_layer_index >= 0) {
+      if (m_layer_index >= 0 && cv->layout ().is_valid_layer (m_layer_index)) {
         const auto &lp = cv->layout ().get_properties (m_layer_index);
         if (! lp.name.empty () && m_source_real.name () != lp.name) {
           m_source_real.name (lp.name);