Clean up afterwards

voicegardens/static/voicegardens.js

@@ -92,11 +92,10 @@ function gardenOfflineLimits() {
   for (let i = 0; i < shapes.length; i++) {
     let shape = shapes[i];
     shape.hide();
+    shape = null;
   }
 
-  while (shapes.length > 0) {
-    shapes.pop();
-  }
+  shapes = [];
 
   return true;
 }