Solved How to create a mob counter?

[Funtime]

I'm trying to create a mob counter, and just trying to count for 1 animal to make sure it works. The command works but it always says I've killed 0 chickens after I've killed many.
My current code:

on join:
if {chicken.%player%} is not set:
set {chicken.%player%} to 0

on death:
if attacker is a player:
if victim is a chicken:
add 1 to {chicken.%player%}
send "&aYou killed a chicken!"

command /chicken:
trigger:
send "&aYou have killed &c%{chicken.%player%}% &achickens!"

 

[ShaneBee]

Line 7 needs to be:
add 1 to {chicken.%attacker%}

 

[ShaneBee]

Line 7 needs to be:
add 1 to {chicken.%attacker%}

Thanks!