Back off the array spreading, bc poltergeist freaks out.

app/assets/javascripts/dispatcher.js.es6

@@ -296,8 +296,7 @@
     };
 
     Dispatcher.prototype.initFieldErrors = function() {
-      var flaggedForms = document.querySelectorAll('.show-gl-field-errors');
-      return [...flaggedForms].forEach(function(form) {
+      $('.show-gl-field-errors').each((i, form) => {
         new gl.GlFieldErrors(form);
       });
     };