diff --git a/src/DoctrineAuditBundle/AuditReader.php b/src/DoctrineAuditBundle/AuditReader.php
index 04258b77..4ef93ae5 100644
--- a/src/DoctrineAuditBundle/AuditReader.php
+++ b/src/DoctrineAuditBundle/AuditReader.php
@@ -98,7 +98,7 @@ public function getAudits($entity, int $id = null, int $page = 1, int $pageSize
     {
         $connection = $this->entityManager->getConnection();
 
-        $schema = $this->entityManager->getClassMetadata($entity)->table['schema'] ? $this->entityManager->getClassMetadata($entity)->table['schema'] . '.' : '';
+        $schema = isset($this->entityManager->getClassMetadata($entity)->table['schema']) ? $this->entityManager->getClassMetadata($entity)->table['schema'] . '.' : '';
 
         $auditTable = implode('', [
             $schema,
@@ -143,7 +143,7 @@ public function getAudit($entity, int $id)
     {
         $connection = $this->entityManager->getConnection();
 
-        $schema = $this->entityManager->getClassMetadata($entity)->table['schema'] ? $this->entityManager->getClassMetadata($entity)->table['schema'] . '.' : '';
+        $schema = isset($this->entityManager->getClassMetadata($entity)->table['schema']) ? $this->entityManager->getClassMetadata($entity)->table['schema'] . '.' : '';
 
         $auditTable = implode('', [
             $schema,