diff -u b/core/lib/Drupal/Core/Config/Entity/ThirdPartySettingsTrait.php b/core/lib/Drupal/Core/Config/Entity/ThirdPartySettingsTrait.php
--- b/core/lib/Drupal/Core/Config/Entity/ThirdPartySettingsTrait.php
+++ b/core/lib/Drupal/Core/Config/Entity/ThirdPartySettingsTrait.php
@@ -71,18 +71,13 @@
    * Gets all third-party settings of a given module.
    *
    * @param string $module
-   *   The module providing the third-party setting.
+   *   The module providing the third-party settings.
    *
    * @return array
    *   An array of key-value pairs.
    */
   public function getThirdPartySettings($module) {
-    if (isset($this->third_party_settings[$module])) {
-      return $this->third_party_settings[$module];
-    }
-    else {
-      return array();
-    }
+    return isset($this->third_party_settings[$module]) ? $this->third_party_settings[$module] : array();
   }
 
   /**