delegate not working

composer.json

{
    "require": {
        "propel/propel": "~2.0@dev"
    }
}

log.txt

rubenvincenten@ruben ~/Sites/factoriomods
  % propel build                                                                                                                                                                 
PHP Notice:  Undefined offset: 0 in /Users/rubenvincenten/Sites/factoriomods/vendor/propel/propel/src/Propel/Generator/Model/ForeignKey.php on line 554
PHP Stack trace:
PHP   1. {main}() /Users/rubenvincenten/Sites/factoriomods/vendor/propel/propel/bin/propel:0
PHP   2. include() /Users/rubenvincenten/Sites/factoriomods/vendor/propel/propel/bin/propel:4
PHP   3. Symfony\Component\Console\Application->run() /Users/rubenvincenten/Sites/factoriomods/vendor/propel/propel/bin/propel.php:29
PHP   4. Symfony\Component\Console\Application->doRun() /Users/rubenvincenten/Sites/factoriomods/vendor/symfony/console/Symfony/Component/Console/Application.php:124
PHP   5. Symfony\Component\Console\Application->doRunCommand() /Users/rubenvincenten/Sites/factoriomods/vendor/symfony/console/Symfony/Component/Console/Application.php:193
PHP   6. Symfony\Component\Console\Command\Command->run() /Users/rubenvincenten/Sites/factoriomods/vendor/symfony/console/Symfony/Component/Console/Application.php:889
PHP   7. Propel\Generator\Command\ModelBuildCommand->execute() /Users/rubenvincenten/Sites/factoriomods/vendor/symfony/console/Symfony/Component/Console/Command/Command.php:252
PHP   8. Propel\Generator\Manager\ModelManager->build() /Users/rubenvincenten/Sites/factoriomods/vendor/propel/propel/src/Propel/Generator/Command/ModelBuildCommand.php:133
PHP   9. Propel\Generator\Manager\ModelManager->doBuild() /Users/rubenvincenten/Sites/factoriomods/vendor/propel/propel/src/Propel/Generator/Manager/ModelManager.php:68
PHP  10. Propel\Generator\Builder\Om\AbstractOMBuilder->build() /Users/rubenvincenten/Sites/factoriomods/vendor/propel/propel/src/Propel/Generator/Manager/ModelManager.php:170
PHP  11. Propel\Generator\Builder\Om\QueryBuilder->addClassBody() /Users/rubenvincenten/Sites/factoriomods/vendor/propel/propel/src/Propel/Generator/Builder/Om/AbstractOMBuilder.php:73
PHP  12. Propel\Generator\Builder\Om\QueryBuilder->addFilterByFk() /Users/rubenvincenten/Sites/factoriomods/vendor/propel/propel/src/Propel/Generator/Builder/Om/QueryBuilder.php:220
PHP  13. Propel\Generator\Model\ForeignKey->getLocalColumn() /Users/rubenvincenten/Sites/factoriomods/vendor/propel/propel/src/Propel/Generator/Builder/Om/QueryBuilder.php:1137
PHP  14. Propel\Generator\Model\ForeignKey->getLocalColumnName() /Users/rubenvincenten/Sites/factoriomods/vendor/propel/propel/src/Propel/Generator/Model/ForeignKey.php:565

Notice: Undefined offset: 0 in /Users/rubenvincenten/Sites/factoriomods/vendor/propel/propel/src/Propel/Generator/Model/ForeignKey.php on line 554

Call Stack:
    0.0002     226568   1. {main}() /Users/rubenvincenten/Sites/factoriomods/vendor/propel/propel/bin/propel:0
    0.0004     238888   2. include('/Users/rubenvincenten/Sites/factoriomods/vendor/propel/propel/bin/propel.php') /Users/rubenvincenten/Sites/factoriomods/vendor/propel/propel/bin/propel:4
    0.0422    2951616   3. Symfony\Component\Console\Application->run() /Users/rubenvincenten/Sites/factoriomods/vendor/propel/propel/bin/propel.php:29
    0.0463    3287080   4. Symfony\Component\Console\Application->doRun() /Users/rubenvincenten/Sites/factoriomods/vendor/symfony/console/Symfony/Component/Console/Application.php:124
    0.0464    3287968   5. Symfony\Component\Console\Application->doRunCommand() /Users/rubenvincenten/Sites/factoriomods/vendor/symfony/console/Symfony/Component/Console/Application.php:193
    0.0464    3288440   6. Symfony\Component\Console\Command\Command->run() /Users/rubenvincenten/Sites/factoriomods/vendor/symfony/console/Symfony/Component/Console/Application.php:889
    0.0469    3292736   7. Propel\Generator\Command\ModelBuildCommand->execute() /Users/rubenvincenten/Sites/factoriomods/vendor/symfony/console/Symfony/Component/Console/Command/Command.php:252
    0.1031    6018760   8. Propel\Generator\Manager\ModelManager->build() /Users/rubenvincenten/Sites/factoriomods/vendor/propel/propel/src/Propel/Generator/Command/ModelBuildCommand.php:133
    0.2243   11049712   9. Propel\Generator\Manager\ModelManager->doBuild() /Users/rubenvincenten/Sites/factoriomods/vendor/propel/propel/src/Propel/Generator/Manager/ModelManager.php:68
    0.2244   11052224  10. Propel\Generator\Builder\Om\AbstractOMBuilder->build() /Users/rubenvincenten/Sites/factoriomods/vendor/propel/propel/src/Propel/Generator/Manager/ModelManager.php:170
    0.2258   11085824  11. Propel\Generator\Builder\Om\QueryBuilder->addClassBody() /Users/rubenvincenten/Sites/factoriomods/vendor/propel/propel/src/Propel/Generator/Builder/Om/AbstractOMBuilder.php:73
    0.2278   11106984  12. Propel\Generator\Builder\Om\QueryBuilder->addFilterByFk() /Users/rubenvincenten/Sites/factoriomods/vendor/propel/propel/src/Propel/Generator/Builder/Om/QueryBuilder.php:220
    0.2282   11108344  13. Propel\Generator\Model\ForeignKey->getLocalColumn() /Users/rubenvincenten/Sites/factoriomods/vendor/propel/propel/src/Propel/Generator/Builder/Om/QueryBuilder.php:1137
    0.2282   11108392  14. Propel\Generator\Model\ForeignKey->getLocalColumnName() /Users/rubenvincenten/Sites/factoriomods/vendor/propel/propel/src/Propel/Generator/Model/ForeignKey.php:565

  [Propel\Generator\Exception\InvalidArgumentException]  
  No columns were specified.                             

propel.yml

propel:
  database:
    connections:
      factoriomods:
        adapter: sqlite
        dsn: sqlite:storage/db/db.sqlite
        user:xxxx
        password:xxxx
        settings:
          charset: utf8
  runtime:
    log:
      defaultLogger:
        type: stream
        path: storage/log/propel.log
    defaultConnection: factoriomods
    connections:
      - factoriomods
  generator:
    defaultConnection: factoriomods
    connections:
      - factoriomods
  general:
    project: factoriomods
    version: 0.1
  paths:
    outputDir: generated
    phpDir: generated/classes
    phpConfDir: generated/conf
    sqlDir: generated/sql
    migrationDir: generated/migrations

schema.xml

<?xml version="1.0" encoding="UTF-8"?>
<database name="factoriomods"
          heavyIndexing="true"
          defaultIdMethod="native"
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:noNamespaceSchemaLocation="http://xsd.propelorm.org/1.6/database.xsd">

    <table name="wysiwyg">
        <column name="html" type="LONGVARCHAR" lazyLoad="true"/>
        <behavior name="i18n">
            <parameter name="i18n_columns" value="html"/>
        </behavior>
        <behavior name="timestampable"/>
    </table>


    <table name="mod">
        <column name="title" type="VARCHAR" required="true" primaryString="true"/>

        <behavior name="timestampable"/>
        <behavior name="sluggable"/>

        <behavior name="delegate">
            <parameter name="to" value="wysiwyg"/>
        </behavior>

        <behavior name="i18n">
            <parameter name="i18n_columns" value="title"/>
        </behavior>
    </table>

    <table name="tab">
        <column name="title" type="VARCHAR" required="true"/>
        <column name="mod_id" required="true"/>
        <foreign-key foreignTable="mod" onDelete="cascade">
            <reference local="mod_id" foreign="id"/>
        </foreign-key>

        <behavior name="i18n">
            <parameter name="i18n_columns" value="title"/>
        </behavior>
    </table>

    <behavior name="auto_add_pk"/>
</database>

var_dump.txt

class Propel\Generator\Model\ForeignKey#577 (15) {
  private $foreignTableCommonName =>
  string(3) "tab"
  private $foreignSchemaName =>
  NULL
  private $name =>
  NULL
  private $phpName =>
  NULL
  private $refPhpName =>
  NULL
  private $defaultJoin =>
  string(9) "LEFT JOIN"
  private $onUpdate =>
  string(0) ""
  private $onDelete =>
  string(7) "CASCADE"
  private $parentTable =>
  class Propel\Generator\Model\Table#534 (44) {
    private $columns =>
    array(3) {
      [0] =>
      class Propel\Generator\Model\Column#562 (33) {
        ...
      }
      [1] =>
      class Propel\Generator\Model\Column#564 (33) {
        ...
      }
      [2] =>
      class Propel\Generator\Model\Column#566 (33) {
        ...
      }
    }
    private $foreignKeys =>
    array(1) {
      [0] =>
              ...

    }
    private $foreignTableNames =>
    array(1) {
      [0] =>
      string(3) "tab"
    }
    private $indices =>
    array(0) {
    }
    private $unices =>
    array(0) {
    }
    private $idMethodParameters =>
    array(0) {
    }
    private $commonName =>
    string(7) "wysiwyg"
    private $originCommonName =>
    string(7) "wysiwyg"
    private $description =>
    NULL
    private $phpName =>
    string(7) "Wysiwyg"
    private $idMethod =>
    string(6) "native"
    private $allowPkInsert =>
    bool(false)
    private $phpNamingMethod =>
    string(10) "underscore"
    private $database =>
    class Propel\Generator\Model\Database#508 (26) {
      private $platform =>
      class Propel\Generator\Platform\SqlitePlatform#509 (5) {
        ...
      }
      private $tables =>
      array(6) {
        ...
      }
      private $name =>
      string(12) "factoriomods"
      private $baseClass =>
      NULL
      private $defaultIdMethod =>
      string(6) "native"
      private $defaultPhpNamingMethod =>
      string(10) "underscore"
      private $defaultAccessorVisibility =>
      string(6) "public"
      private $defaultMutatorVisibility =>
      string(6) "public"
      private $domainMap =>
      array(0) {
        ...
      }
      private $heavyIndexing =>
      bool(true)
      private $identifierQuoting =>
      bool(false)
      private $parentSchema =>
      class Propel\Generator\Model\Schema#507 (5) {
        ...
      }
      private $tablesByName =>
      array(6) {
        ...
      }
      private $tablesByLowercaseName =>
      array(6) {
        ...
      }
      private $tablesByPhpName =>
      array(6) {
        ...
      }
      private $sequences =>
      NULL
      protected $defaultStringFormat =>
      string(4) "YAML"
      protected $tablePrefix =>
      NULL
      protected $package =>
      NULL
      protected $packageOverridden =>
      bool(false)
      protected $namespace =>
      string(0) ""
      protected $schema =>
      NULL
      protected $attributes =>
      array(5) {
        ...
      }
      protected $vendorInfos =>
      array(0) {
        ...
      }
      protected $behaviors =>
      array(1) {
        ...
      }
      private $behaviorLocator =>
      class Propel\Generator\Util\BehaviorLocator#541 (3) {
        ...
      }
    }
    private $referrers =>
    array(1) {
      [0] =>
      class Propel\Generator\Model\ForeignKey#584 (15) {
        ...
      }
    }
    private $containsForeignPK =>
    NULL
    private $inheritanceColumn =>
    NULL
    private $skipSql =>
    bool(false)
    private $readOnly =>
    bool(false)
    private $isAbstract =>
    bool(false)
    private $alias =>
    NULL
    private $interface =>
    NULL
    private $baseClass =>
    NULL
    private $columnsByName =>
    array(3) {
      'created_at' =>
      class Propel\Generator\Model\Column#562 (33) {
        ...
      }
      'updated_at' =>
      class Propel\Generator\Model\Column#564 (33) {
        ...
      }
      'id' =>
      class Propel\Generator\Model\Column#566 (33) {
        ...
      }
    }
    private $columnsByLowercaseName =>
    array(3) {
      'created_at' =>
      class Propel\Generator\Model\Column#562 (33) {
        ...
      }
      'updated_at' =>
      class Propel\Generator\Model\Column#564 (33) {
        ...
      }
      'id' =>
      class Propel\Generator\Model\Column#566 (33) {
        ...
      }
    }
    private $columnsByPhpName =>
    array(3) {
      'CreatedAt' =>
      class Propel\Generator\Model\Column#562 (33) {
        ...
      }
      'UpdatedAt' =>
      class Propel\Generator\Model\Column#564 (33) {
        ...
      }
      'Id' =>
      class Propel\Generator\Model\Column#566 (33) {
        ...
      }
    }
    private $needsTransactionInPostgres =>
    NULL
    private $heavyIndexing =>
    bool(true)
    private $identifierQuoting =>
    NULL
    private $forReferenceOnly =>
    NULL
    private $reloadOnInsert =>
    bool(false)
    private $reloadOnUpdate =>
    bool(false)
    private $defaultAccessorVisibility =>
    string(6) "public"
    private $defaultMutatorVisibility =>
    string(6) "public"
    protected $isCrossRef =>
    bool(false)
    protected $defaultStringFormat =>
    NULL
    protected $package =>
    NULL
    protected $packageOverridden =>
    bool(false)
    protected $namespace =>
    string(0) ""
    protected $schema =>
    NULL
    protected $attributes =>
    array(1) {
      'name' =>
      string(7) "wysiwyg"
    }
    protected $vendorInfos =>
    array(0) {
    }
    protected $behaviors =>
    array(3) {
      'i18n' =>
      class Propel\Generator\Behavior\I18n\I18nBehavior#542 (14) {
        ...
      }
      'timestampable' =>
      class Propel\Generator\Behavior\Timestampable\TimestampableBehavior#543 (11) {
        ...
      }
      'auto_add_pk' =>
      class Propel\Generator\Behavior\AutoAddPk\AutoAddPkBehavior#559 (11) {
        ...
      }
    }
    private $behaviorLocator =>
    class Propel\Generator\Util\BehaviorLocator#541 (3) {
      private $behaviors =>
      NULL
      private $composerDir =>
      NULL
      private $generatorConfig =>
      class Propel\Generator\Config\GeneratorConfig#49 (3) {
        ...
      }
    }
  }
  private $localColumns =>
  array(0) {
  }
  private $foreignColumns =>
  array(0) {
  }
  private $skipSql =>
  bool(false)
  private $autoNaming =>
  bool(false)
  protected $attributes =>
  array(0) {
  }
  protected $vendorInfos =>
  array(0) {
  }
}