diff --git a/lib/Doctrine/ORM/Mapping/Driver/DatabaseDriver.php b/lib/Doctrine/ORM/Mapping/Driver/DatabaseDriver.php
index c6c4547b6..0dc6a05e0 100644
--- a/lib/Doctrine/ORM/Mapping/Driver/DatabaseDriver.php
+++ b/lib/Doctrine/ORM/Mapping/Driver/DatabaseDriver.php
@@ -22,6 +22,7 @@ namespace Doctrine\ORM\Mapping\Driver;
 use Doctrine\Common\Cache\ArrayCache,
     Doctrine\Common\Annotations\AnnotationReader,
     Doctrine\DBAL\Schema\AbstractSchemaManager,
+    Doctrine\DBAL\Schema\SchemaException,
     Doctrine\ORM\Mapping\ClassMetadataInfo,
     Doctrine\ORM\Mapping\MappingException,
     Doctrine\Common\Util\Inflector;
@@ -128,6 +129,11 @@ class DatabaseDriver implements Driver
 
         $columns = $this->tables[$tableName]->getColumns();
         $indexes = $this->tables[$tableName]->getIndexes();
+        try {
+            $primaryKeyColumns = $this->tables[$tableName]->getPrimaryKey()->getColumns();
+        } catch(SchemaException $e) {
+            $primaryKeyColumns = array();
+        }
         
         if ($this->_sm->getDatabasePlatform()->supportsForeignKeyConstraints()) {
             $foreignKeys = $this->tables[$tableName]->getForeignKeys();
@@ -144,7 +150,7 @@ class DatabaseDriver implements Driver
         $fieldMappings = array();
         foreach ($columns as $column) {
             $fieldMapping = array();
-            if (isset($indexes['primary']) && in_array($column->getName(), $indexes['primary']->getColumns())) {
+            if ($primaryKeyColumns && in_array($column->getName(), $primaryKeyColumns)) {
                 $fieldMapping['id'] = true;
             } else if (in_array($column->getName(), $allForeignKeyColumns)) {
                 continue;