Oatly vanilla SoftServe at Wrigley field

I am trying to figure out if my allergy son can have the Oatly soft serve at Wrigley field (cubs) before we go on Sunday.  He is allergic to peas.  On Oatly website, pea protein is not an ingredient listed, but on Wrigley field's website, pea protein is listed.  I'm hoping that Wrigley just hasn't updated their website and there are no longer peas in the ice-cream.  I will double check when I'm there, but if there is a way of knowing before going so I don't get my son's hopes up, that's always ideal.  Thank you