Please help, query.where causing error and I don't know why

[TheFriendlyFoe]

I'm using Firestroe to store different "games" that are scouted. I want to be able to get all of the documents that were scouted on the same team. My query doesn't work when I add
query.where("team_num", FirestoreQuery.OPERATOR.EQUAL, 1)
It gives me the error "Trying to return a value of type Nil from a function which the return type is Array"
When i remove this line, my code works (except for the fact that I get all the data, not just one team's data)

These are pics of my firebase data that im using to test this