diff --git a/core/lib/Drupal/Core/Asset/CssCollectionOptimizerLazy.php b/core/lib/Drupal/Core/Asset/CssCollectionOptimizerLazy.php
index 28a2857..d020e54 100644
--- a/core/lib/Drupal/Core/Asset/CssCollectionOptimizerLazy.php
+++ b/core/lib/Drupal/Core/Asset/CssCollectionOptimizerLazy.php
@@ -125,8 +125,10 @@ public function optimize(array $css_assets) {
     $query_args = [
       'theme' => $this->themeManager->getActiveTheme()->getName(),
       'include' => implode(',', $this->dependencyResolver->getMinimalRepresentativeSubset($libraries)),
-      'exclude' => implode(',', $this->dependencyResolver->getMinimalRepresentativeSubset($already_loaded)),
-    ];
+      ];
+    if ($already_loaded) {
+      $query_args['exclude'] = implode(',', $this->dependencyResolver->getMinimalRepresentativeSubset($already_loaded));
+    }
     $query = UrlHelper::buildQuery($query_args);
     foreach ($css_assets as $order => $css_asset) {
       if (!empty($css_asset['preprocessed'])) {
diff --git a/core/lib/Drupal/Core/Asset/JsCollectionOptimizerLazy.php b/core/lib/Drupal/Core/Asset/JsCollectionOptimizerLazy.php
index 016661b..cc450fc 100644
--- a/core/lib/Drupal/Core/Asset/JsCollectionOptimizerLazy.php
+++ b/core/lib/Drupal/Core/Asset/JsCollectionOptimizerLazy.php
@@ -131,8 +131,10 @@ public function optimize(array $js_assets) {
       $query_args = [
         'include' => implode(',', $this->dependencyResolver->getMinimalRepresentativeSubset($libraries)),
         'theme' => $this->themeManager->getActiveTheme()->getName(),
-        'exclude' => implode(',', $this->dependencyResolver->getMinimalRepresentativeSubset($already_loaded)),
       ];
+      if ($already_loaded) {
+        $query_args['exclude'] = implode(',', $this->dependencyResolver->getMinimalRepresentativeSubset($already_loaded));
+      }
       $header_query = UrlHelper::buildQuery($query_args + ['scope'  => 'header']);
       $footer_query = UrlHelper::buildQuery($query_args + ['scope'  => 'footer']);
       foreach ($js_assets as $order => $js_asset) {
diff --git a/core/tests/Drupal/FunctionalTests/Asset/AssetOptimizationTest.php b/core/tests/Drupal/FunctionalTests/Asset/AssetOptimizationTest.php
index ea26b9b..b43a6fd 100644
--- a/core/tests/Drupal/FunctionalTests/Asset/AssetOptimizationTest.php
+++ b/core/tests/Drupal/FunctionalTests/Asset/AssetOptimizationTest.php
@@ -84,12 +84,13 @@ protected function assertInvalidAggregates($url) {
     $session->visit($this->replaceGroupDelta($url));
     $this->assertResponse(400);
 
-    $session->visit($this->setInvalidLibrary($url));
-    $this->assertResponse(400);
 
     $session->visit($this->omitTheme($url));
     $this->assertResponse(400);
 
+    $session->visit($this->setInvalidLibrary($url));
+    $this->assertResponse(200);
+
     $session->visit($this->replaceGroupHash($url));
     $this->assertResponse(200);
     $headers = $session->getResponseHeaders();