diff --git a/voicegardens/static/voicegardens.js b/voicegardens/static/voicegardens.js
index 3369af6..61703ac 100644
--- a/voicegardens/static/voicegardens.js
+++ b/voicegardens/static/voicegardens.js
@@ -1,4 +1,5 @@
-"use strict";
+// Note(decentral1se): in order to use the `delete` operator
+// "use strict";
 
 //
 // Voicegardens front-end Javascript
@@ -92,7 +93,7 @@ function gardenOfflineLimits() {
   for (let i = 0; i < shapes.length; i++) {
     let shape = shapes[i];
     shape.hide();
-    shape = null;
+    delete shape;
   }
 
   shapes = [];