Pointer Column Query

I can't figure out why this update query won't work. I have a list of tasks. The tasks table has a pointer column to the list it belongs to. Can anyone see the problem in the syntax?

var result = Collection.multiUpdateObject(AppConfig.dbId, "tasks",
'collName': 'lists',
'_id': requestBody.list_id
Apperyio.response.success(result, "application/json");
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