well first of all, u dont have ESP_loop() actually looped
Code:
set_task(2.0,"ESP_loop", 0, "", 0, "b")
and u cant get user's steamid before he is authorized, until that its just STEAM_ID_PENDING or sumtin.. so change client_connect() to client_authorized()
(though i had a problem with client_authorized(), the id was still pending.. so if it doesnt work for u either, maybe set a task to check the access later

)
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