diff --git a/modules/plugins/theme/supported-themes.nix b/modules/plugins/theme/supported-themes.nix
index 1d1f2397..ad1f8a3d 100644
--- a/modules/plugins/theme/supported-themes.nix
+++ b/modules/plugins/theme/supported-themes.nix
@@ -246,10 +246,10 @@ in {
         transparent = {
           enabled = ${boolToString transparent},
         },
-        ${optionalString (!isNull palette) ''palette = "${palette}",''}
-        ${optionalString (!isNull variant) ''variant = "${variant}",''}
+        ${optionalString (palette != null) ''palette = "${palette}",''}
+        ${optionalString (variant != null) ''variant = "${variant}",''}
       }
-      ${optionalString (!isNull background) ''vim.opt.background = "${background}"''}
+      ${optionalString (background != null) ''vim.opt.background = "${background}"''}
       vim.cmd.colorscheme "solarized"
     '';
     styles = let
diff --git a/modules/plugins/utility/binds/which-key/config.nix b/modules/plugins/utility/binds/which-key/config.nix
index 625a6215..7d5ef6c1 100644
--- a/modules/plugins/utility/binds/which-key/config.nix
+++ b/modules/plugins/utility/binds/which-key/config.nix
@@ -10,7 +10,7 @@
   inherit (lib.nvim.dag) entryAnywhere;
 
   cfg = config.vim.binds.whichKey;
-  register = mapAttrsToList (n: v: lib.lists.optional (! isNull v) (mkLuaInline "{ '${n}', desc = '${v}' }")) cfg.register;
+  register = mapAttrsToList (n: v: lib.lists.optional (v != null) (mkLuaInline "{ '${n}', desc = '${v}' }")) cfg.register;
 in {
   config = mkIf cfg.enable {
     vim = {