diff -r 706f10bcdc3c -r f5690d918358 server/src/app/Libraries/RdfModel/RdfModelDelta.php
--- a/server/src/app/Libraries/RdfModel/RdfModelDelta.php	Sun Oct 02 19:11:06 2016 +0200
+++ b/server/src/app/Libraries/RdfModel/RdfModelDelta.php	Sun Oct 02 19:14:07 2016 +0200
@@ -31,7 +31,7 @@
         return $this->deleteWhere;
     }
 
-    public function addDeleteWhere(string $value) {
+    public function addDeleteWhere($value) {
         array_push($this->deleteWhere, $value);
         return $this;
     }