Adarkar Valkyrie ability causing crash in EDH

[myfuckingcardbroke]

Using Adarkar Valkyrie ability on Brion Stoutarm after Brian was declared to block a creature. After combat damage calculated, got given a prompt to send Brion to command zone. Selecting either yes or no gave the following error making the game unplayable:

An error has occurred on the MAGE server. Your last action will be rollbacked.
Please post the following report here:

[myfuckingcardbroke]

Game exception occurred: java.lang.NullPointerException
Server version: 1.4.28V1
mage.cards.a.AdarkarValkyrieDelayedTriggeredAbility.checkTrigger(AdarkarValkyrie.java:146)
mage.abilities.DelayedTriggeredAbilities.checkTriggers(DelayedTriggeredAbilities.java:67)
mage.game.GameState.handleEvent(GameState.java:682)
mage.game.GameState.handleSimultaneousEvent(GameState.java:671)
mage.game.GameImpl.checkStateAndTriggered(GameImpl.java:1688)

[myfuckingcardbroke]

mage.game.GameImpl.playPriority(GameImpl.java:1316)
mage.game.turn.Step.priority(Step.java:87)