From 2cb8a8ba00b960af48e837e0993243f050c84404 Mon Sep 17 00:00:00 2001
From: JiangNan <1394485448@qq.com>
Date: Sun, 8 Mar 2026 12:54:42 +0800
Subject: [PATCH] fix: guard against None values in _apply_transform to prevent
 AttributeError

Signed-off-by: JiangNan <1394485448@qq.com>
---
 crawl4ai/extraction_strategy.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/crawl4ai/extraction_strategy.py b/crawl4ai/extraction_strategy.py
index 6be1c7c7b..4df7c83b4 100644
--- a/crawl4ai/extraction_strategy.py
+++ b/crawl4ai/extraction_strategy.py
@@ -1216,6 +1216,9 @@ def _apply_transform(self, value, transform):
             str: The transformed value.
         """
 
+        if value is None:
+            return value
+
         if transform == "lowercase":
             return value.lower()
         elif transform == "uppercase":