diff --git a/app/system/traits/CombinesAssets.php b/app/system/traits/CombinesAssets.php
index eb18bdb343..955c2dadb6 100644
--- a/app/system/traits/CombinesAssets.php
+++ b/app/system/traits/CombinesAssets.php
@@ -175,7 +175,7 @@ protected function prepareAssets(array $assets)
             return $this->getAssetPath($path);
         }, $assets);
 
-        return $assets;
+        return array_filter($assets);
     }
 
     protected function prepareCombiner(array $assets, $targetPath = null)