diff --git a/static/js/map.js b/static/js/map.js
index c01d3c7..7410379 100644
--- a/static/js/map.js
+++ b/static/js/map.js
@@ -1,3 +1,7 @@
+if (![].at) {
+  Array.prototype.at = function(pos) { return this.slice(pos, pos + 1)[0] }
+}
+
 function emoji_icon(emoji) {
   var iconStyle = "<div style='background-color: white; border-radius: 50%; width: 30px; height: 30px; display: flex; justify-content: center; align-items: center; border: 1px solid black;'> <div style='font-size: 18px;'>" + emoji + "</div></div>";