diff --git a/src/DocumentArray.php b/src/DocumentArray.php
index 685d320..56f92bc 100644
--- a/src/DocumentArray.php
+++ b/src/DocumentArray.php
@@ -87,7 +87,7 @@ public function toDocument(&$document) {
 	}
 
 	public function fromDocument($document) {
-		$this->ids = $document[$this->key];
+		$this->ids = (array)$document[$this->key];
 	}
 
 	public function setModifier(&$modifier) {