diff --git a/builder/default.nix b/builder/default.nix
index d7ecc92..94bcffd 100644
--- a/builder/default.nix
+++ b/builder/default.nix
@@ -95,8 +95,8 @@ in
     # this function gets passed all the way into the wrapper so that we can also add
     # other dependencies that get resolved later in the process such as treesitter grammars.
     nixCats = allPluginDeps: pkgs.stdenv.mkDerivation (let
-      isUnwrappedCfgPath = settings.wrapRc == false && settings.unwrappedCfgPath != null && builtins.isString settings.unwrappedCfgPath;
-      isStdCfgPath = settings.wrapRc == false && ! isUnwrappedCfgPath;
+      isUnwrappedCfgPath = settings.wrapRc == false && builtins.isString settings.unwrappedCfgPath;
+      isStdCfgPath = settings.wrapRc == false && ! builtins.isString settings.unwrappedCfgPath;
 
       nixCats_config_location = if isUnwrappedCfgPath then "${settings.unwrappedCfgPath}"
         else if isStdCfgPath then ncTools.mkLuaInline ''vim.fn.stdpath("config")''