[v1k1nG]

PHP код:

if(sscanf(params, "s[80]",reason)) return SendClientMessage(playerid,-1,""chat" /(re)port [Reason]"); 


You need to specify the id to report:

PHP код:

new reportid; // Define that now before using sscanf
if(sscanf(params, "ds[80]",reportid, reason)) return SendClientMessage(playerid,-1,""chat" /(re)port [ID] [Reason]"); 


And

PHP код:

reportid = cache_get_field_content_int(playerid, "ID"); 


That ID doesn't mean (I guess) PLAYERID, but the account id saved in the database.