How can i check if a variable is set for another variable?

[ItzGabryXV_]

_player is a random player (This is not part of the code):
if {_casualinjury} is 1:
if {ipotermia::{_player}} is not set:
add {_player} to {febbre::*}
send title "&cSTAI MALE" with subtitle "&eTi senti molto accaldato" to {_player} for 4 seconds
apply slowness 2 to {_player} for 10 seconds
apply poison 1 to {_player} for 5 seconds
apply nausea 1 to {_player} for 3 seconds

i dont know how to check if {_player} is in {ipotermia::*}

How can i fix that "if {ipotermia::{_player}} is not set:" making it usable?

 

[erenkara]

you must surround expressions inside variables with % like you do in strings
{var::%{_player}%}

 

[ItzGabryXV_]

you must surround expressions inside variables with % like you do in strings
{var::%{_player}%}

Thanks!