diff --git a/litellm/proxy/route_llm_request.py b/litellm/proxy/route_llm_request.py
index 96e6f705cca..79e8f41972f 100644
--- a/litellm/proxy/route_llm_request.py
+++ b/litellm/proxy/route_llm_request.py
@@ -128,7 +128,12 @@ _shared_session_lock: Optional[asyncio.Lock] = None
 
 
 def _get_shared_session_lock() -> asyncio.Lock:
-    """Lazily create the shared session lock (must be called within a running event loop)."""
+    """Lazily create the shared session lock (must be called within a running event loop).
+
+    WARNING: Do not reset _shared_session_lock to None while any coroutine may be
+    executing the session-recovery path; doing so breaks the double-checked locking
+    guarantee and can cause duplicate session creation.
+    """
     global _shared_session_lock
     if _shared_session_lock is None:
         _shared_session_lock = asyncio.Lock()
diff --git a/tests/test_litellm/proxy/test_aiohttp_session_recovery.py b/tests/test_litellm/proxy/test_aiohttp_session_recovery.py
index 224a4aa1392..a2b09527962 100644
--- a/tests/test_litellm/proxy/test_aiohttp_session_recovery.py
+++ b/tests/test_litellm/proxy/test_aiohttp_session_recovery.py
@@ -161,7 +161,6 @@ async def test_add_shared_session_concurrent_recreation_uses_lock():
         call_count += 1
         # Simulate some async work
         await asyncio.sleep(0.01)
-        proxy_server_module.shared_aiohttp_session = new_session
         return new_session
 
     with patch.object(