From 3a5ace33b6d44478b82d2cff827490f3a384251f Mon Sep 17 00:00:00 2001
From: cthomas <caren@letta.com>
Date: Tue, 6 Jan 2026 12:44:18 -0800
Subject: [PATCH] fix: nonetype not subscriptable (#8345)

---
 letta/services/agent_manager.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/letta/services/agent_manager.py b/letta/services/agent_manager.py
index 10cd123d..5ee15af9 100644
--- a/letta/services/agent_manager.py
+++ b/letta/services/agent_manager.py
@@ -1399,7 +1399,7 @@ class AgentManager:
 
         tool_rules_solver = ToolRulesSolver(agent_state.tool_rules)
 
-        if agent_state.message_ids == []:
+        if not agent_state.message_ids:  # Handles both None and empty list
             curr_system_message = None
         else:
             curr_system_message = await self.message_manager.get_message_by_id_async(message_id=agent_state.message_ids[0], actor=actor)