From 31b7592179c6d3282c8f1f9bb978753a11163998 Mon Sep 17 00:00:00 2001
From: HelloClyde <helloclyde@qq.com>
Date: Thu, 16 Oct 2025 07:59:40 +0800
Subject: [PATCH] Fix missing safe initialization of descendants in loops

---
 comfy_execution/caching.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/comfy_execution/caching.py b/comfy_execution/caching.py
index d58f931f2..350a5247b 100644
--- a/comfy_execution/caching.py
+++ b/comfy_execution/caching.py
@@ -420,6 +420,8 @@ class DependencyAwareCache(BasicCache):
         subcache = await super()._ensure_subcache(node_id, children_ids)
         await self.cache_key_set.add_keys(children_ids)
         for child_id in children_ids:
+            if child_id not in self.descendants:
+                self.descendants[child_id] = set()
             self.descendants[node_id].add(child_id)
             if child_id not in self.ancestors:
                 self.ancestors[child_id] = set()