- Fixed PHP notice in unserialize() caused by $keyColumn not being initialized.

lib/Doctrine/Collection.php

@@ -169,6 +169,7 @@ class Doctrine_Collection extends Doctrine_Access implements Countable, Iterator
 
         $this->_table = $connection->getTable($this->_table);
 
+        $keyColumn = isset($array['keyColumn']) ? $array['keyColumn'] : null;
         if ($keyColumn === null) {
             $keyColumn = $this->_table->getBoundQueryPart('indexBy');
         }