Modified Battle Stations ability crashes the game

[HerlySQR]

Hello, I wanted to create a custom burrow that can load my custom peons using a modified version of the Battle Stations ability, but for some reason when the unit loads into the burrow the game crashes, I don't know why, do you know what is happening?

new UnitDefinition(ASSAULTER_BUILDER, 'opeo')
    ..setNormalAbilities("Ahrp")
    ..setRace(Race.Human)
    ..setGoldCost(0)
    ..setFoodCost(0)
    ..setAttacksEnabled(0)
    ..setStockMaximum(1)
    ..setStockReplenishInterval(1)
    ..setHitPointsMaximumBase(50)
    ..setStructuresBuilt(commaList(CRATES, BURROW))
    ..setButtonPositionX(0)
    ..setButtonPositionY(0)
    ..setHotkey("Q")
    ..setName("Builder")
    ..setTooltipBasic("Hire builder")
    ..setTooltipExtended("This builder can help you to build useful structures.")

/*let load = ABIL_ID_GEN.next()
new AbilityDefinitionBattlestationsChaos(load)
    ..setAllowedUnitType(1, ASSAULTER_BUILDER.toRawCode())*/

new BuildingDefinition(BURROW, 'otrb')
    ..setNormalAbilities(""/*load.toRawCode()*/)
    ..setAttack1DamageBase(9)
    ..setAttack1DamageNumberofDice(1)
    ..setAttack1DamageSidesperDie(1)
    ..setDefenseBase(1)
    ..setResearchesAvailable("")
    ..setUpgradesUsed("")
    ..setHitPointsMaximumBase(50)
    ..setBuildTime(7)
    ..setGoldCost(0)
    ..setLumberCost(0)
    ..setRequirements("")
    ..setButtonPositionX(1)
    ..setButtonPositionY(2)
    ..setHotkey("X")
    ..setName("Burrow")
    ..setTooltipBasic("Build burrow")
    ..setTooltipExtended("A burrow where the builders can enter to attack from it.")

 

[Duckfarter]

The burrow must have cargo hold and at least the capability to load 1 unit.