This is a working minimal reproduction of a bug in the Meteor Atmosphere package dburles:collection-helpers described/reported on these issues:
dburles/meteor-collection-helpers#73
vsivsi/meteor-file-collection#152
To run, clone this repo, go to its root directory and run meteor.
It will throw an error in the console when the bug is encountered:
Error: Post-helper find with document selector is wrong
at server/main.js:79:13
at Function.time (/Users/vsi/helper-bug/.meteor/local/build/programs/server/profile.js:301:28)
at /Users/vsi/helper-bug/.meteor/local/build/programs/server/boot.js:304:13
at /Users/vsi/helper-bug/.meteor/local/build/programs/server/boot.js:345:5
at Function.run (/Users/vsi/helper-bug/.meteor/local/build/programs/server/profile.js:480:12)
at /Users/vsi/helper-bug/.meteor/local/build/programs/server/boot.js:343:11