Graphql mutation change_column_value doesn't allways update and return undefined result intermittently

I’m using the Graphql API to update Monday - but it behaves inconsistently and doesn’t always perform the update.
I’ve noticed in my log, that in some calls to the change_column_value mutation, it returns undefined - I think these are the cases where it doesn’t save the change, but it’s all very inconsistent - because if I call it again, it does save.

What are the cases where change_column_value returns undefined?
Should I add logic that will repeat the update until it doesn’t return undefined?

Here’s the graphql:

      mutation ($id: Int!,$value:JSON!,$board:Int!,$column_id:String!) {
   change_column_value(
     item_id:$id
     column_id:$column_id,
     board_id:$board,
     value:$value
   ) {
     id
    name,
    column_values(ids:[$column_id]){
      id
      value
    }
   }
}

Here’s a link to my code on github:

I would love to hear from you