diff --git a/layouts/partials/script/single-script.html b/layouts/partials/script/single-script.html
index 4a23c59..11c8d84 100644
--- a/layouts/partials/script/single-script.html
+++ b/layouts/partials/script/single-script.html
@@ -457,7 +457,6 @@
 
     // ============================= katex =============================
     if (lib && lib.includes('katex')) {
-      var mathElements = document.getElementsByClassName('math');
       var options = {
         delimiters: [
           { left: "$$", right: "$$", display: true },