From 4065e846f6d3b42041d93790dbba46341b2a49e8 Mon Sep 17 00:00:00 2001
From: "Md. Mamun Hossain" <muhammed.mamun.131@gmail.com>
Date: Thu, 18 Jun 2026 17:31:02 +0600
Subject: [PATCH] =?UTF-8?q?fix(ts-sdk):=20prevent=20hallucinated=20memorie?=
 =?UTF-8?q?s=20on=20empty=20messages=20payload=20=E2=80=A6=20(#5613)?=
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---
 mem0-ts/src/client/mem0.ts                         |  5 +++++
 mem0-ts/src/client/tests/memoryClient.crud.test.ts | 13 ++++++-------
 2 files changed, 11 insertions(+), 7 deletions(-)

diff --git a/mem0-ts/src/client/mem0.ts b/mem0-ts/src/client/mem0.ts
index b2d1cca85..713650d34 100644
--- a/mem0-ts/src/client/mem0.ts
+++ b/mem0-ts/src/client/mem0.ts
@@ -253,6 +253,11 @@ export default class MemoryClient {
     messages: Array<Message>,
     options: AddMemoryOptions & Record<string, any> = {},
   ): Promise<Array<Memory>> {
+    // Tightly scoped validation guard to resolve #5465
+    if (!messages || (Array.isArray(messages) && messages.length === 0)) {
+      throw new Error("Cannot process an empty messages payload.");
+    }
+
     if (this.telemetryId === "") await this.ping();
 
     const payload = this._preparePayload(messages, options);
diff --git a/mem0-ts/src/client/tests/memoryClient.crud.test.ts b/mem0-ts/src/client/tests/memoryClient.crud.test.ts
index 39e3f1733..0da9be2a9 100644
--- a/mem0-ts/src/client/tests/memoryClient.crud.test.ts
+++ b/mem0-ts/src/client/tests/memoryClient.crud.test.ts
@@ -59,16 +59,15 @@ describe("MemoryClient - add()", () => {
     expect(getFetchBody(call!).user_id).toBe("user_1");
   });
 
-  test("sends empty messages array without crashing", async () => {
-    const extra = new Map<string, { status: number; body: unknown }>();
-    extra.set("/v3/memories/add/", { status: 200, body: [] });
-    const mock = setupMockFetch(extra);
+  test("throws an error when given an empty messages array", async () => {
+    setupMockFetch();
 
     const client = new MemoryClient({ apiKey: TEST_API_KEY });
-    await client.add([], { userId: "u1" });
 
-    const call = findFetchCall(mock, "/v3/memories/add/", "POST");
-    expect(getFetchBody(call!).messages).toEqual([]);
+    //Asserts that the validation guard catches the empty input early
+    await expect(client.add([], { userId: "u1" })).rejects.toThrow(
+      "Cannot process an empty messages payload.",
+    );
   });
 });