diff --git a/src/ReadModel/Index/Projector.php b/src/ReadModel/Index/Projector.php
index <HASH>..<HASH> 100644
--- a/src/ReadModel/Index/Projector.php
+++ b/src/ReadModel/Index/Projector.php
@@ -326,8 +326,8 @@ class Projector implements EventListenerInterface
             $eventId,
             EntityType::EVENT(),
             $userId,
-            null,
-            null,
+            '',
+            '',
             $this->localDomain,
             $creationDate
         );
diff --git a/test/ReadModel/Index/ProjectorTest.php b/test/ReadModel/Index/ProjectorTest.php
index <HASH>..<HASH> 100644
--- a/test/ReadModel/Index/ProjectorTest.php
+++ b/test/ReadModel/Index/ProjectorTest.php
@@ -224,8 +224,8 @@ class ProjectorTest extends \PHPUnit_Framework_TestCase
                 $eventId,
                 EntityType::EVENT(),
                 $userId,
-                null,
-                null,
+                '',
+                '',
                 Domain::specifyType('omd.be'),
                 $this->isInstanceOf(\DateTime::class)
             );
III-<I> Title and zip should be set to default empty string instead of null.