From 33c910ddd3cb99bab974184343b37d90034140a6 Mon Sep 17 00:00:00 2001
From: John Tramm <john.tramm@gmail.com>
Date: Wed, 14 Feb 2024 23:19:10 -0600
Subject: [PATCH] Fix issue with Cell::get_contained_cells() utility function
 (#2873)

---
 src/cell.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/cell.cpp b/src/cell.cpp
index 00083d967b..a46f05687e 100644
--- a/src/cell.cpp
+++ b/src/cell.cpp
@@ -1272,6 +1272,9 @@ struct ParentCellStack {
   //! compute an instance for the provided distribcell index
   int32_t compute_instance(int32_t distribcell_index) const
   {
+    if (distribcell_index == C_NONE)
+      return 0;
+
     int32_t instance = 0;
     for (const auto& parent_cell : this->parent_cells_) {
       auto& cell = model::cells[parent_cell.cell_index];