From a3aee7c37733c4cfb3ddf7f2f559fb8847dd9bae Mon Sep 17 00:00:00 2001
From: Pablo Iyu Guerrero <95311543+pabloiyu@users.noreply.github.com>
Date: Wed, 27 Aug 2025 09:43:01 +0200
Subject: [PATCH] =?UTF-8?q?fix:=20HiRadixCache:=20fix=20prefetch=20complet?=
 =?UTF-8?q?ion=C2=A0race=20(#9397)?=
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---
 python/sglang/srt/mem_cache/hiradix_cache.py | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/python/sglang/srt/mem_cache/hiradix_cache.py b/python/sglang/srt/mem_cache/hiradix_cache.py
index c0bd0a3f8..61039913a 100644
--- a/python/sglang/srt/mem_cache/hiradix_cache.py
+++ b/python/sglang/srt/mem_cache/hiradix_cache.py
@@ -434,9 +434,12 @@ class HiRadixCache(RadixCache):
         if self.prefetch_stop_policy == "best_effort":
             return can_terminate
 
-        completed = (
-            operation.completed_tokens == len(operation.hash_value) * self.page_size
-        )
+        if len(operation.hash_value) == 0:
+            completed = False
+        else:
+            completed = (
+                operation.completed_tokens == len(operation.hash_value) * self.page_size
+            )
 
         if self.prefetch_stop_policy == "wait_complete":
             can_terminate = completed