diff --git a/lib/Doctrine/ORM/Mapping/Driver/YamlDriver.php b/lib/Doctrine/ORM/Mapping/Driver/YamlDriver.php
index a6880b018..86621d0fb 100644
--- a/lib/Doctrine/ORM/Mapping/Driver/YamlDriver.php
+++ b/lib/Doctrine/ORM/Mapping/Driver/YamlDriver.php
@@ -488,18 +488,20 @@ class YamlDriver extends FileDriver
                         $joinTable['schema'] = $joinTableElement['schema'];
                     }
 
-                    foreach ($joinTableElement['joinColumns'] as $joinColumnName => $joinColumnElement) {
-                        if ( ! isset($joinColumnElement['name'])) {
-                            $joinColumnElement['name'] = $joinColumnName;
-                        }
+                    if (isset($joinTableElement['joinColumns'])) {
+                        foreach ($joinTableElement['joinColumns'] as $joinColumnName => $joinColumnElement) {
+                            if ( ! isset($joinColumnElement['name'])) {
+                                $joinColumnElement['name'] = $joinColumnName;
+                            }
 
                         $joinTable['joinColumns'][] = $this->joinColumnToArray($joinColumnElement);
                     }
 
-                    foreach ($joinTableElement['inverseJoinColumns'] as $joinColumnName => $joinColumnElement) {
-                        if ( ! isset($joinColumnElement['name'])) {
-                            $joinColumnElement['name'] = $joinColumnName;
-                        }
+                    if (isset($joinTableElement['inverseJoinColumns'])) {
+                        foreach ($joinTableElement['inverseJoinColumns'] as $joinColumnName => $joinColumnElement) {
+                            if ( ! isset($joinColumnElement['name'])) {
+                                $joinColumnElement['name'] = $joinColumnName;
+                            }
 
                         $joinTable['inverseJoinColumns'][] = $this->joinColumnToArray($joinColumnElement);
                     }