Exception in setInterval callback: MongoError: Cannot apply $pull to a non-array value

I keep getting this error in cmd while my meteor app is running. It doesn’t seem to interfere with anything (nothing that I can see at least) so I can’t tell its source.

I20161101-20:19:50.072(3)? Exception in setInterval callback: MongoError: Cannot apply $pull to a non-array value
I20161101-20:19:50.075(3)?     at Object.Future.wait (C:\Users\admin\AppData\Local\.meteor\packages\meteor-tool\1.4.1_3\mt-os.windows.x86_32\dev_bundle\server-lib\node_modules\fibers\future.js:449:15)
I20161101-20:19:50.077(3)?     at MongoConnection.<anonymous> (packages/meteor/helpers.js:119:1)
I20161101-20:19:50.079(3)?     at MongoConnection.(anonymous function) [as update] (packages/mongo/mongo_driver.js:774:49)
I20161101-20:19:50.081(3)?     at [object Object].update (packages/mongo/collection.js:589:29)
I20161101-20:19:50.082(3)?     at AccountsServer.Ap._expirePasswordResetTokens (packages/accounts-base/accounts_server.js:1137:14)
I20161101-20:19:50.084(3)?     at packages/accounts-base/accounts_server.js:1174:14

I20161101-20:19:50.086(3)?     at [object Object]._.extend.withValue (packages/meteor/dynamics_nodejs.js:56:1)
I20161101-20:19:50.088(3)?     at packages/meteor/timers.js:6:1
I20161101-20:19:50.090(3)?     at runWithEnvironment (packages/meteor/dynamics_nodejs.js:110:1)
I20161101-20:19:50.091(3)?     - - - - -
I20161101-20:19:50.093(3)?     at Function.MongoError.create (C:\Users\admin\AppData\Local\.meteor\packages\npm-mongo\2.2.11_2\npm\node_modules\mongodb-core\lib\error.js:31:11)
I20161101-20:19:50.095(3)?     at toError (C:\Users\admin\AppData\Local\.meteor\packages\npm-mongo\2.2.11_2\npm\node_modules\mongodb\lib\utils.js:115:22)
I20161101-20:19:50.097(3)?     at C:\Users\admin\AppData\Local\.meteor\packages\npm-mongo\2.2.11_2\npm\node_modules\mongodb\lib\collection.js:1046:67
I20161101-20:19:50.098(3)?     at C:\Users\admin\AppData\Local\.meteor\packages\npm-mongo\2.2.11_2\npm\node_modules\mongodb-core\lib\connection\pool.js:455:18
I20161101-20:19:50.100(3)?     at nextTickCallbackWith0Args (node.js:420:9)
I20161101-20:19:50.102(3)?     at process._tickCallback (node.js:349:13)
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