Return value of getAssociationMapping in class Doctrine\ORM\Mapping\ClassMetadataInfo

The problem is in the comment of function return value is Doctrine\ORM\Mapping\AssociationMapping.
My code expected to work with object of this type and normal situation is Fatal error: Call to a member function isOneToOne() on a non-object in /home/vis/projects/crm/trunk/library/Viscomp/Doctrine/Repository.php on line 371.

In my mind I suppose is normal to return object of Doctrine\ORM\Mapping\AssociationMapping, because in comment return value have this type.

I will be grateful if have fast answer because this is blocking issue for my project.

 /**
     * Gets the mapping of an association.
     *
     * @param string $fieldName  The field name that represents the association in
     *                           the object model.
     * @return Doctrine\ORM\Mapping\AssociationMapping  The mapping.
     */
    public function getAssociationMapping($fieldName)
    {
        if ( ! isset($this->associationMappings[$fieldName])) {
            throw MappingException::mappingNotFound($this->name, $fieldName);
        }
        return $this->associationMappings[$fieldName];
    }