Party can not show pokemon with id: nil

[Jerakin]

Party can not show pokemon with id: nil
stack traceback:
	screens/party/party.lua:89: in function 'show'
	screens/party/party.gui_script:20: in function <screens/party/party.gui_script:12>
	[C]: in function 'resume'
	monarch/monarch.lua:893: in function 'on_message'
	monarch/screen_factory.script:43: in function <monarch/screen_factory.script:35>