diff --git a/apps/web/lib/jobs/job.ts b/apps/web/lib/jobs/job.ts
index 6010f2e..fb164d7 100644
--- a/apps/web/lib/jobs/job.ts
+++ b/apps/web/lib/jobs/job.ts
@@ -45,7 +45,7 @@ export function narrowJob(raw: unknown): JobView {
     status: asStatus(dict["status"]),
     progress: asProgress(dict["progress"]),
     result: asResult(dict["result"]),
-    error: typeof dict["error"] === "string" ? (dict["error"] as string) : null,
+    error: typeof dict["error"] === "string" ? dict["error"] : null,
   };
 }
 
diff --git a/apps/web/lib/stream/sse.ts b/apps/web/lib/stream/sse.ts
index 4c2f7a7..1ac9c21 100644
--- a/apps/web/lib/stream/sse.ts
+++ b/apps/web/lib/stream/sse.ts
@@ -85,7 +85,7 @@ export class SseFrameBuffer {
     let idx: number;
     // 块之间以空行（\n\n，兼容 \r\n\r\n）分隔。
     while ((idx = this.findBoundary(this.buf)) !== -1) {
-      const block = this.buf.slice(0, idx.valueOf());
+      const block = this.buf.slice(0, idx);
       this.buf = this.buf.slice(this.boundaryEnd(this.buf, idx));
       const evt = parseSseBlock(block);
       if (evt) events.push(evt);