From d05f3a0621667f970b8a06fcab210ef3bab466af Mon Sep 17 00:00:00 2001
From: Ben Burns <803016+benjamincburns@users.noreply.github.com>
Date: Fri, 18 Oct 2024 07:19:03 +1300
Subject: [PATCH] fix(checkpoint): don't throw in MemorySaver.list if thread
 not found (#584)

---
 libs/checkpoint/src/memory.ts | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/libs/checkpoint/src/memory.ts b/libs/checkpoint/src/memory.ts
index 72f04807..e247133a 100644
--- a/libs/checkpoint/src/memory.ts
+++ b/libs/checkpoint/src/memory.ts
@@ -178,7 +178,9 @@ export class MemorySaver extends BaseCheckpointSaver {
     const configCheckpointNamespace = config.configurable?.checkpoint_ns;
 
     for (const threadId of threadIds) {
-      for (const checkpointNamespace of Object.keys(this.storage[threadId])) {
+      for (const checkpointNamespace of Object.keys(
+        this.storage[threadId] ?? {}
+      )) {
         if (
           configCheckpointNamespace !== undefined &&
           checkpointNamespace !== configCheckpointNamespace