From 44e9f268890ea296ecacd79ced4636f725fa3c34 Mon Sep 17 00:00:00 2001
From: Quentin Roy <quentin@quentinroy.fr>
Date: Thu, 7 Dec 2023 18:47:58 +0100
Subject: [PATCH] log-client: fix resuming with no matching logs

---
 .changeset/honest-dolls-smash.md      | 5 +++++
 packages/log-client/src/log-client.ts | 9 ++++++---
 2 files changed, 11 insertions(+), 3 deletions(-)
 create mode 100644 .changeset/honest-dolls-smash.md

diff --git a/.changeset/honest-dolls-smash.md b/.changeset/honest-dolls-smash.md
new file mode 100644
index 00000000..8e10df54
--- /dev/null
+++ b/.changeset/honest-dolls-smash.md
@@ -0,0 +1,5 @@
+---
+'@lightmill/log-client': patch
+---
+
+Fix resuming a log when there are no matching logs found.
diff --git a/packages/log-client/src/log-client.ts b/packages/log-client/src/log-client.ts
index f6029e16..a1f99511 100644
--- a/packages/log-client/src/log-client.ts
+++ b/packages/log-client/src/log-client.ts
@@ -164,8 +164,9 @@ export class LogClient<ClientLog extends Typed & OptionallyDated = AnyLog> {
         .filter((l): l is { type: T } & typeof l =>
           resumeAfterLastSet.has(l.type),
         )
-        .reduce((maxLog, log) =>
-          maxLog.lastNumber > log.lastNumber ? maxLog : log,
+        .reduce(
+          (maxLog, log) => (maxLog.lastNumber > log.lastNumber ? maxLog : log),
+          { lastNumber: 0, count: 0, type: null as null | T },
         );
       await Interface.resumeRun({
         apiRoot: this.#apiRoot,
@@ -177,7 +178,9 @@ export class LogClient<ClientLog extends Typed & OptionallyDated = AnyLog> {
       this.#experimentId = experimentId;
       this.#runStatus = 'running';
       this.#logCount = lastLog.lastNumber;
-      return { type: lastLog.type, number: lastLog.count };
+      return lastLog.type == null
+        ? null
+        : { type: lastLog.type, number: lastLog.count };
     } catch (err) {
       this.#runStatus = 'error';
       throw err;