diff --git a/rich/style.py b/rich/style.py
index 3806a8c4b9..3061f04d35 100644
--- a/rich/style.py
+++ b/rich/style.py
@@ -507,7 +507,7 @@ def parse(cls, style_definition: str) -> "Style":
         Returns:
             `Style`: A Style instance.
         """
-        if style_definition.strip() == "none" or not style_definition:
+        if str(style_definition).strip() == "none" or not style_definition:
             return cls.null()
 
         STYLE_ATTRIBUTES = cls.STYLE_ATTRIBUTES