Sometimes (when user bleed’s out for example might be on others as well) the local_player_name is missing from the kill_feed event
example log line:
{"name":"kill_feed","data":"{\r\n \"attackerName\": \"0Mandragor0\",\r\n \"victimName\": \"Lcasm\",\r\n \"weaponName\": \"Bleed Out\",\r\n \"action\": \"Bleed Out\"\r\n}"}