From d7d39873ce795e652b9d30ada9ed53b2510b59c8 Mon Sep 17 00:00:00 2001
From: VANDRANKI <prabhukiranvandranki@gmail.com>
Date: Sun, 4 Oct 2026 16:20:26 -0400
Subject: [PATCH] Python: Fix VolatileMemoryStore.get_nearest_matches on an
 empty collection

---
 .../memory/volatile_memory_store.py           |  2 ++
 ..._volatile_memory_store_empty_collection.py | 29 +++++++++++++++++++
 2 files changed, 31 insertions(+)
 create mode 100644 python/tests/unit/memory/test_volatile_memory_store_empty_collection.py

diff --git a/python/semantic_kernel/memory/volatile_memory_store.py b/python/semantic_kernel/memory/volatile_memory_store.py
index dd1a631d0614..16968fd9810c 100644
--- a/python/semantic_kernel/memory/volatile_memory_store.py
+++ b/python/semantic_kernel/memory/volatile_memory_store.py
@@ -250,6 +250,8 @@ async def get_nearest_matches(
 
         # Get all the records in the collection
         memory_records = list(self._store[collection_name].values())
+        if not memory_records:
+            return []
 
         # Convert the collection of embeddings into a numpy array (stacked)
         embeddings = array([x._embedding for x in memory_records], dtype=float)
diff --git a/python/tests/unit/memory/test_volatile_memory_store_empty_collection.py b/python/tests/unit/memory/test_volatile_memory_store_empty_collection.py
new file mode 100644
index 000000000000..37a63dcd0ef3
--- /dev/null
+++ b/python/tests/unit/memory/test_volatile_memory_store_empty_collection.py
@@ -0,0 +1,29 @@
+# Copyright (c) Microsoft. All rights reserved.
+
+import numpy as np
+
+from semantic_kernel.memory.memory_record import MemoryRecord
+from semantic_kernel.memory.volatile_memory_store import VolatileMemoryStore
+
+
+async def test_get_nearest_matches_empty_collection_returns_empty_list():
+    store = VolatileMemoryStore()
+    await store.create_collection("c")
+
+    result = await store.get_nearest_matches("c", np.array([1.0, 2.0]), limit=3)
+
+    assert result == []
+
+
+async def test_get_nearest_matches_after_removing_all_records_returns_empty_list():
+    store = VolatileMemoryStore()
+    await store.create_collection("c")
+    record = MemoryRecord.local_record(
+        id="a", text="t", description=None, additional_metadata=None, embedding=np.array([1.0, 0.0])
+    )
+    await store.upsert("c", record)
+    await store.remove("c", "a")
+
+    result = await store.get_nearest_matches("c", np.array([1.0, 0.0]), limit=1)
+
+    assert result == []