[Meteor 1.5.1 -> Meteor 1.5.2] "Assertion failed: query.results not an array"

After upgrading to Meteor 1.5.2, I am experiencing some issues with what I believe is related to subscriptions/publications. The publication is composite and the subscription is non-abnormal. I can show the publication/subscription if that will be helpful.

I’m not sure how to approach this error past what has already been investigated.

Uncaught Error: Assertion failed: query.results not an array
    at http://localhost:3000/packages/minimongo.js?hash=8cd7b53507123da052698c62ae61243696868347:2432:19
    at Array.forEach (native)
    at LocalCollection.update (http://localhost:3000/packages/minimongo.js?hash=8cd7b53507123da052698c62ae61243696868347:2417:33)
    at Object.update (http://localhost:3000/packages/mongo.js?hash=191d09671a8d33340d4acaaa8c6015f73cc58072:260:30)
    at Object.store.(anonymous function) [as update] (http://localhost:3000/packages/ddp-client.js?hash=8b46f76bbf82e182fe81190d0eea965a685cbd77:3732:60)
    at http://localhost:3000/packages/ddp-client.js?hash=8b46f76bbf82e182fe81190d0eea965a685cbd77:4539:19
    at Array.forEach (native)
    at Function._.each._.forEach (http://localhost:3000/packages/underscore.js?hash=cde485f60699ff9aced3305f70189e39c665183c:149:11)
    at http://localhost:3000/packages/ddp-client.js?hash=8b46f76bbf82e182fe81190d0eea965a685cbd77:4538:13
    at Function._.each._.forEach (http://localhost:3000/packages/underscore.js?hash=cde485f60699ff9aced3305f70189e39c665183c:157:22)

Pretty hard to assess the situation. The pub/sub would be helpful.