From d53ea1d0af58cfdcd230e75ba4ac58453bdbd808 Mon Sep 17 00:00:00 2001
From: Jacques Lucke <jacques@blender.org>
Date: Sat, 23 Jul 2022 14:37:39 +0200
Subject: Fix T99905: wrong toposort when the node tree is cyclic

---
 source/blender/nodes/intern/node_tree_ref.cc | 1 +
 1 file changed, 1 insertion(+)

(limited to 'source/blender')

diff --git a/source/blender/nodes/intern/node_tree_ref.cc b/source/blender/nodes/intern/node_tree_ref.cc
index 64a8690a869..05e7fe33776 100644
--- a/source/blender/nodes/intern/node_tree_ref.cc
+++ b/source/blender/nodes/intern/node_tree_ref.cc
@@ -522,6 +522,7 @@ static void toposort_from_start_node(const NodeTreeRef::ToposortDirection direct
   /* Do a depth-first search to sort nodes topologically. */
   Stack<Item, 64> nodes_to_check;
   nodes_to_check.push({&start_node});
+  node_states[start_node.id()].is_in_stack = true;
   while (!nodes_to_check.is_empty()) {
     Item &item = nodes_to_check.peek();
     const NodeRef &node = *item.node;
-- 
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