Hey,
If someone get killed by the Patrolhelicopter the following text is displayed in Chat.

[Death Notes] BattleSheep was shredded by the {killer}.​

Some Ideas how to fix this?

As a workaround you can replace {killer} by PatrolHelicopter in config.

I see at the Tank i have the same issue

i have changed the {killer} to Helicopter and it's ok now, but when a player kills the heli it shows {killer} and no player's name. When the heli kills a player its ok