[SmiT]

@i514x_

if ( sscanf( params,"us", id, string ) ) return SendClientMessage(playerid,COLOR_GRAY,"SYNTAX: /report [id] [reason]");

Should be:

if ( sscanf( params,"us[128]", id, string ) ) return SendClientMessage(playerid,COLOR_GRAY,"SYNTAX: /report [id] [reason]");