From ac82187f5b0c57a1ca98cbb8e653104be538bce4 Mon Sep 17 00:00:00 2001
From: Thomas Gelf <thomas@gelf.net>
Date: Thu, 7 Apr 2016 15:48:31 +0200
Subject: [PATCH] BpNode: fix error for missing children

---
 library/Businessprocess/BpNode.php | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/library/Businessprocess/BpNode.php b/library/Businessprocess/BpNode.php
index f413c96..f71f531 100644
--- a/library/Businessprocess/BpNode.php
+++ b/library/Businessprocess/BpNode.php
@@ -139,6 +139,8 @@ class BpNode extends Node
     public function getMissingChildren()
     {
         if ($this->missingChildren === null) {
+            $missing = array();
+
             foreach ($this->getChildren() as $child) {
                 if ($child->isMissing()) {
                     $missing[(string) $child] = $child;