if attacker is player not working

[zenonsufu]

on damage:
if attacker is player:

error message

Use 'attacker' and/or 'victim' in damage/death events

1.19.2 version

 

[Aarush Jain]

Are you intending properly?

on damage:
if attacker is player:

error message

Use 'attacker' and/or 'victim' in damage/death events

1.19.2 version

on damage of a player:
    if attacker is a player;
        # Anything you want to do here

 

[AvantyCZ]

on damage:
    if attacker is a player:
        send "test" to attacker

You forgot on "a" between is and player.