diff --git a/lib/Service/ObjectService.php b/lib/Service/ObjectService.php
index 909bff7..08655db 100755
--- a/lib/Service/ObjectService.php
+++ b/lib/Service/ObjectService.php
@@ -828,7 +828,7 @@ private function handleArrayProperty(
 			return $items;
 		}
 
-		if ($property['items']['type'] !== 'object'
+		if (isset($property['items']['type']) === true && $property['items']['type'] !== 'object'
 			&& $property['items']['type'] !== 'file'
 		) {
 			return $items;
@@ -1799,6 +1799,10 @@ public function setDefaults(ObjectEntity $objectEntity): ObjectEntity
 		$data = $objectEntity->jsonSerialize();
 		$schema = $this->schemaMapper->find($objectEntity->getSchema());
 
+        if ($schema->getProperties() === null) {
+            return $objectEntity;
+        }
+
 		foreach ($schema->getProperties() as $name=>$property) {
 			if (isset($data[$name]) === false && isset($property['default']) === true) {
 				$data[$name] = $this->twig->createTemplate($property['default'], "{$schema->getTitle()}.$name")->render($objectEntity->getObjectArray());