commit 0817413d550cb5a6085fdce9bae486e9bafd8665
Author: Damien Tournoud <damien@commerceguys.com>
Date:   Mon Sep 24 20:57:41 2012 +0200

    Issue #1410306: make the query alteration code more robust.

diff --git a/plugins/selection/EntityReference_SelectionHandler_Generic.class.php b/plugins/selection/EntityReference_SelectionHandler_Generic.class.php
index 6f9a267..9c34258 100644
--- a/plugins/selection/EntityReference_SelectionHandler_Generic.class.php
+++ b/plugins/selection/EntityReference_SelectionHandler_Generic.class.php
@@ -356,7 +356,7 @@ class EntityReference_SelectionHandler_Generic_user extends EntityReference_Sele
       // database.
       $conditions = &$query->conditions();
       foreach ($conditions as $key => $condition) {
-        if ($key !== '#conjunction' && $condition['field'] == 'users.name') {
+        if ($key !== '#conjunction' && is_string($condition['field']) && $condition['field'] === 'users.name') {
           // Remove the condition.
           unset($conditions[$key]);
 
@@ -413,7 +413,7 @@ class EntityReference_SelectionHandler_Generic_comment extends EntityReference_S
     // bundle.
     $conditions = &$query->conditions();
     foreach ($conditions as $key => &$condition) {
-      if ($key !== '#conjunction' && $condition['field'] == 'node_type') {
+      if ($key !== '#conjunction' && is_string($condition['field']) && $condition['field'] === 'node_type') {
         $condition['field'] = $node_alias . '.type';
         foreach ($condition['value'] as &$value) {
           if (substr($value, 0, 13) == 'comment_node_') {
@@ -480,7 +480,7 @@ class EntityReference_SelectionHandler_Generic_taxonomy_term extends EntityRefer
     // the bundle.
     $conditions = &$query->conditions();
     foreach ($conditions as $key => &$condition) {
-      if ($key !== '#conjunction' && $condition['field'] == 'vocabulary_machine_name') {
+      if ($key !== '#conjunction' && is_string($condition['field']) && $condition['field'] === 'vocabulary_machine_name') {
         $condition['field'] = $vocabulary_alias . '.machine_name';
         break;
       }