Planks dupe

See this video!
http://www.youtube.com/watch?v=skpF1GqkgY4

I fixed this bug using MCP:
Class "EntityBoat", method "attackEntityFrom(DamageSource, int)":
Before:
if(!var3)
{
dropItemWithOffset(Item.boat.itemID, 1, 0F);
}
After:
if(!var3 && par1DamageSource.getEntity() != null)
{
dropItemWithOffset(Item.boat.itemID, 1, 0F);
}