diff --git a/src/JsonClient.php b/src/JsonClient.php
index 4cdc1e6..61e7853 100644
--- a/src/JsonClient.php
+++ b/src/JsonClient.php
@@ -419,6 +419,10 @@ protected function joinValues(array $json, array $keys) {
    * {@inheritdoc}
    */
   public function trackUsage(array $used_entities, $path, $published, $type) {
+    if (empty($used_entities)) {
+      // No need to fetch publications, if we don't have entities to track.
+      return;
+    }
 
     $dcx_status = $published ? 'pubstatus-published' : 'pubstatus-unpublished';