diff --git a/packages/cli/src/lib/api/conversations.ts b/packages/cli/src/lib/api/conversations.ts
index cf338228d..3f7f7dc05 100644
--- a/packages/cli/src/lib/api/conversations.ts
+++ b/packages/cli/src/lib/api/conversations.ts
@@ -159,7 +159,7 @@ export async function getConversationSpans(
     );
 
     if (page === 0) {
-      stats = data.stats;
+      stats = data.stats ?? undefined;
       title = data.title;
     }
     spans.push(...data.spans);
diff --git a/packages/cli/src/types/conversation.ts b/packages/cli/src/types/conversation.ts
index 87b83649d..1d19ac11d 100644
--- a/packages/cli/src/types/conversation.ts
+++ b/packages/cli/src/types/conversation.ts
@@ -11,6 +11,7 @@ import {
   type InferOutput,
   looseObject,
   nullable,
+  nullish,
   number,
   object,
   optional,
@@ -120,8 +121,11 @@ export const AgentConversationDetailsSchema = looseObject({
   conversationId: string(),
   title: nullable(string()),
   spans: array(AgentConversationSpanSchema),
-  /** Added after the original envelope; optional for older self-hosted servers. */
-  stats: optional(ConversationStatsSchema),
+  /**
+   * Added after the original envelope; missing on older self-hosted servers.
+   * The server sends `null` on every page after the first.
+   */
+  stats: nullish(ConversationStatsSchema),
 });
 
 export type AgentConversationDetails = InferOutput<
diff --git a/packages/cli/test/lib/api/conversations.test.ts b/packages/cli/test/lib/api/conversations.test.ts
index 0aadb3d07..5512ef7c0 100644
--- a/packages/cli/test/lib/api/conversations.test.ts
+++ b/packages/cli/test/lib/api/conversations.test.ts
@@ -408,6 +408,35 @@ describe("getConversationSpans", () => {
     expect(getCapturedUrls()[1]).toContain("cursor=page-2-cursor");
   });
 
+  test("keeps first-page stats when later pages send stats: null", async () => {
+    const stats: ConversationStats = {
+      errors: 2,
+      llmCalls: 3,
+      toolCalls: 4,
+      toolErrors: 1,
+      totalCost: 0.5,
+      totalTokens: 900,
+    };
+    mockSequential([
+      {
+        body: makeEnvelope([makeSpan("span-page-1-aa11")], "Long run", stats),
+        headers: linkHeader("page-2-cursor"),
+      },
+      {
+        body: {
+          ...makeEnvelope([makeSpan("span-page-2-bb22")], null),
+          stats: null,
+        },
+      },
+    ]);
+
+    const result = await getConversationSpans(ORG, CONV_ID);
+
+    expect(result.spans).toHaveLength(2);
+    expect(result.stats).toEqual(stats);
+    expect(result.title).toBe("Long run");
+  });
+
   test("returns truncated=true when pagination limit reached", async () => {
     // Create responses that always have more pages
     const responses = Array.from({ length: MAX_PAGINATION_PAGES }, (_, i) => ({