diff -u b/core/lib/Drupal/Core/Config/Entity/Query/Condition.php b/core/lib/Drupal/Core/Config/Entity/Query/Condition.php
--- b/core/lib/Drupal/Core/Config/Entity/Query/Condition.php
+++ b/core/lib/Drupal/Core/Config/Entity/Query/Condition.php
@@ -39,7 +39,7 @@
             $condition['operator'] = is_array($condition['value']) ? 'IN' : '=';
           }
           if (isset($entity->{$condition['field']})) {
-            $value = $entity->{$condition['field']};
+            $value = $entity->get($condition['field']);
             switch ($condition['operator']) {
               case '=':
                 $match = $value == $condition['value'];