Fixed FlexObject::freeMedia() method causing media to become null

CHANGELOG.md

@@ -13,6 +13,7 @@
     * Fixed `onBlueprintCreated` firing multiple times recursively
     * Fixed media upload failing with custom folders
     * Fixed `unset()` in `ObjectProperty` class
+    * Fixed `FlexObject::freeMedia()` method causing media to become null
 
 # v1.7.0-rc.16
 ## 09/01/2020

system/src/Grav/Framework/Flex/Traits/FlexMediaTrait.php

@@ -274,6 +274,14 @@ trait FlexMediaTrait
         $this->clearMediaCache();
     }
 
+    /**
+     * @return void
+     */
+    protected function freeMedia(): void
+    {
+        $this->unsetObjectProperty('media');
+    }
+
     /**
      * @param string $uri
      * @return Medium|null