diff --git a/static/js/MathJaxPolyfill.js b/static/js/MathJaxPolyfill.js
index 6c09d8ce..66f83b30 100644
--- a/static/js/MathJaxPolyfill.js
+++ b/static/js/MathJaxPolyfill.js
@@ -1,8 +1,10 @@
 function MathJaxPolyfillInit(){
-  var typesetPromise = function() {
-    return new Promise(function (resolve, reject) {
-      MathJax.Hub.Queue(["Typeset",MathJax.Hub],[resolve]);
-    })
+  if (!MathJax.typesetPromise) {
+    var typesetPromise = function() {
+      return new Promise(function (resolve, reject) {
+        MathJax.Hub.Queue(["Typeset",MathJax.Hub],[resolve]);
+      })
+    }
+    MathJax.typesetPromise=typesetPromise 
   }
-  MathJax.typesetPromise=typesetPromise
 }
\ No newline at end of file