Weird testerror on PostgreSQL

$ phpunit -c postgresql.phpunit.xml --filter DDC-742
PHPUnit 3.6.5 by Sebastian Bergmann.

Configuration read from /home/benny/code/php/wsnetbeans/doctrine2/postgresql.phpunit.xml

E

Time: 12 seconds, Memory: 36.00Mb

There was 1 error:

1) Doctrine\Tests\ORM\Functional\Ticket\DDC742Test::testIssue
Exception: [PHPUnit_Framework_Error_Notice] Undefined index: 0000000016f5d67f000000001fa7794e

With queries:
11. SQL: 'INSERT INTO comments (content) VALUES (?)' Params: 'baz'
10. SQL: 'INSERT INTO comments (content) VALUES (?)' Params: 'bar'
9. SQL: 'INSERT INTO comments (content) VALUES (?)' Params: 'foo'
8. SQL: 'ALTER TABLE user_comments ADD CONSTRAINT FK_BF13722AF8697D13 FOREIGN KEY (comment_id) REFERENCES comments (id) NOT DEFERRABLE INITIALLY IMMEDIATE' Params: 
7. SQL: 'ALTER TABLE user_comments ADD CONSTRAINT FK_BF13722AA76ED395 FOREIGN KEY (user_id) REFERENCES users (id) NOT DEFERRABLE INITIALLY IMMEDIATE' Params: 
6. SQL: 'CREATE TABLE comments (id SERIAL NOT NULL, content VARCHAR(100) NOT NULL, PRIMARY KEY(id))' Params: 
5. SQL: 'CREATE INDEX IDX_BF13722AF8697D13 ON user_comments (comment_id)' Params: 
4. SQL: 'CREATE INDEX IDX_BF13722AA76ED395 ON user_comments (user_id)' Params: 
3. SQL: 'CREATE TABLE user_comments (user_id INT NOT NULL, comment_id INT NOT NULL, PRIMARY KEY(user_id, comment_id))' Params: 
2. SQL: 'CREATE TABLE users (id SERIAL NOT NULL, title VARCHAR(100) NOT NULL, PRIMARY KEY(id))' Params: 

Trace:
/home/benny/code/php/wsnetbeans/doctrine2/lib/Doctrine/ORM/UnitOfWork.php:2171
/home/benny/code/php/wsnetbeans/doctrine2/lib/Doctrine/ORM/Persisters/ManyToManyPersister.php:113
/home/benny/code/php/wsnetbeans/doctrine2/lib/Doctrine/ORM/Persisters/ManyToManyPersister.php:95
/home/benny/code/php/wsnetbeans/doctrine2/lib/Doctrine/ORM/Persisters/AbstractCollectionPersister.php:130
/home/benny/code/php/wsnetbeans/doctrine2/lib/Doctrine/ORM/Persisters/AbstractCollectionPersister.php:108
/home/benny/code/php/wsnetbeans/doctrine2/lib/Doctrine/ORM/UnitOfWork.php:310
/home/benny/code/php/wsnetbeans/doctrine2/lib/Doctrine/ORM/EntityManager.php:334
/home/benny/code/php/wsnetbeans/doctrine2/tests/Doctrine/Tests/ORM/Functional/Ticket/DDC742Test.php:63


/home/benny/code/php/wsnetbeans/doctrine2/tests/Doctrine/Tests/OrmFunctionalTestCase.php:359