Upgrade to 3.0.2

kirby/src/Cms/Collection.php

@@ -73,7 +73,7 @@ class Collection extends BaseCollection
      */
     public function __set(string $id, $object)
     {
-        $this->data[$object->id()] = $object;
+        $this->data[$id] = $object;
     }
 
     /**
@@ -81,14 +81,16 @@ class Collection extends BaseCollection
      * an entire second collection to the
      * current collection
      *
-     * @param mixed $item
+     * @param mixed $object
      */
     public function add($object)
     {
         if (is_a($object, static::class) === true) {
             $this->data = array_merge($this->data, $object->data);
-        } else {
+        } elseif (method_exists($object, 'id') === true) {
             $this->__set($object->id(), $object);
+        } else {
+            $this->append($object);
         }
 
         return $this;