From ae1f0c6d076dc59c0119cc5a80c6b92a374c6627 Mon Sep 17 00:00:00 2001
From: Rain Jiang <96632942+rainj-me@users.noreply.github.com>
Date: Thu, 2 Jul 2026 14:10:12 -0700
Subject: [PATCH] `session_id` dataclass field should not put in msgpack struct
 (#29977)

---
 python/sglang/srt/managers/io_struct.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/python/sglang/srt/managers/io_struct.py b/python/sglang/srt/managers/io_struct.py
index 842f8faeb..e7f1c2665 100644
--- a/python/sglang/srt/managers/io_struct.py
+++ b/python/sglang/srt/managers/io_struct.py
@@ -806,7 +806,7 @@ class TokenizedGenerateReqInput(BaseReq, kw_only=True):
     return_indexer_topk: bool = False
 
     # Session info for continual prompting
-    session_id: Optional[str] = field(default=None, kw_only=True)
+    session_id: Optional[str] = None
     session_params: Optional[SessionParams] = None
 
     # LoRA related