From db07433ce58f2f6ac9aa0e2fad61181ff5a1442b Mon Sep 17 00:00:00 2001
From: Roger Wang <hey@rogerw.io>
Date: Fri, 9 Jan 2026 05:20:59 -0800
Subject: [PATCH] [Misc] Skip hashing kwargs if value is `None` (#32025)

Signed-off-by: Roger Wang <hey@rogerw.io>
---
 vllm/multimodal/hasher.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/vllm/multimodal/hasher.py b/vllm/multimodal/hasher.py
index cc50322fe..7f0c6d134 100644
--- a/vllm/multimodal/hasher.py
+++ b/vllm/multimodal/hasher.py
@@ -98,6 +98,9 @@ class MultiModalHasher:
         key: str,
         obj: object,
     ) -> Iterable[bytes | memoryview]:
+        if obj is None:
+            yield key.encode("utf-8")
+            return
         # Recursive cases
         if isinstance(obj, (list, tuple)):
             for i, elem in enumerate(obj):