From 1604f4728b95cc8b8b53779532bb9ba66f27cd58 Mon Sep 17 00:00:00 2001
From: Johannes Meyer <johannes.meyer@netways.de>
Date: Tue, 18 Mar 2014 09:00:16 +0100
Subject: [PATCH] Fix that the TreeToSqlParser cannot handle partial
 conjunction nodes

---
 library/Icinga/Data/Db/TreeToSqlParser.php | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/library/Icinga/Data/Db/TreeToSqlParser.php b/library/Icinga/Data/Db/TreeToSqlParser.php
index 20638bf74..b1d482ef7 100644
--- a/library/Icinga/Data/Db/TreeToSqlParser.php
+++ b/library/Icinga/Data/Db/TreeToSqlParser.php
@@ -112,15 +112,14 @@ class TreeToSqlParser
     private function parseConjunctionNode(Node $node)
     {
         $queryString =  '';
-        $leftQuery = $this->nodeToSqlQuery($node->left);
-        $rightQuery = $this->nodeToSqlQuery($node->right);
+        $leftQuery = $node->left !== null ? $this->nodeToSqlQuery($node->left) : '';
+        $rightQuery = $node->right !== null ? $this->nodeToSqlQuery($node->right) : '';
 
         if ($leftQuery != '') {
             $queryString .= $leftQuery . ' ';
         }
 
         if ($rightQuery != '') {
-
             $queryString .= (($queryString !== '') ? $node->type . ' ' : ' ') . $rightQuery;
         }
         return $queryString;