diff --git a/lua/lualine/highlight.lua b/lua/lualine/highlight.lua
index 7072857..42862eb 100644
--- a/lua/lualine/highlight.lua
+++ b/lua/lualine/highlight.lua
@@ -53,7 +53,7 @@ end
 ---@param color string|number
 ---@return string
 local function sanitize_color(color)
-  if color == nil or color == '' then
+  if color == nil or color == '' or (type(color) == 'string' and color:lower() == 'none') then
     return 'None'
   end
   if type(color) == 'string' then