diff --git a/op/op.EditDocument.php b/op/op.EditDocument.php
index bcad9e769..d77e91e9d 100644
--- a/op/op.EditDocument.php
+++ b/op/op.EditDocument.php
@@ -51,9 +51,9 @@ if($document->isLocked()) {
 	}
 }
 
-$name =     $_POST["name"];
-$comment =  $_POST["comment"];
-$keywords = $_POST["keywords"];
+$name =     isset($_POST['name']) ? $_POST["name"] : "";
+$comment =  isset($_POST['comment']) ? $_POST["comment"] : "";
+$keywords = isset($_POST["keywords"]) ? $_POST["keywords"] : "";
 if(isset($_POST['categoryidform1'])) {
 	$categories = explode(',', preg_replace('/[^0-9,]+/', '', $_POST["categoryidform1"]));
 } elseif(isset($_POST["categories"])) {