diff --git a/static/js/floatUtils.js b/static/js/floatUtils.js
index 841e0623..8bfbb171 100644
--- a/static/js/floatUtils.js
+++ b/static/js/floatUtils.js
@@ -19,7 +19,7 @@ class stringFloat{
 }
 function checkFloat(string) {
   try {
-    return !isNaN(parseFloat(string))
+    return !Number.isNaN(parseFloat(string))
   } catch (error) {
     return false
   }