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":