transformPresence is not a function

We're using ShareDB with the nickasd/sharedb-codemirror connector. The editor content is synchronized well and now we want to show other editor's cursors via ShareDB's presence feature.

Creating the doc on the server:

var doc = conn.get('docs', uuid.v4())
doc.create({content: '', metaData: {...}}, null, {}, err => {})

Connecting to the doc from the client:

var doc = conn.get('collection', doc_id)
doc.fetch(callback)
var presence = conn.getDocPresence('collection', doc.id)
var localPresence = presence.create(new ObjectID().toString())

Error message on document edit:

bundle.js:25816 Uncaught TypeError: Cannot read property 'content' of undefined
    at ShareDBCodeMirror.assertValue (bundle.js:25816)
    at ShareDBCodeMirror.afterLocalChanges (bundle.js:25925)
    at ShareDBCodeMirror.codeMirrorChanges (bundle.js:25728)
    at signal (bundle.js:12762)
    at endOperation_finish (bundle.js:16102)
    at endOperations (bundle.js:16003)
    at bundle.js:15986
    at finishOperation (bundle.js:14244)
    at endOperation (bundle.js:15983)
    at runInOp (bundle.js:16112)
assertValue @ bundle.js:25816
afterLocalChanges @ bundle.js:25925
ShareDBCodeMirror.codeMirrorChanges @ bundle.js:25728
signal @ bundle.js:12762
endOperation_finish @ bundle.js:16102
endOperations @ bundle.js:16003
(anonymous) @ bundle.js:15986
finishOperation @ bundle.js:14244
endOperation @ bundle.js:15983
runInOp @ bundle.js:16112
TextareaInput.poll @ bundle.js:21717
(anonymous) @ bundle.js:21502
bundle.js:25717 TypeError: this._doc.type.transformPresence is not a function
    at LocalDocPresence._transformAgainstOp (bundle.js:27856)
    at emitThree (bundle.js:23452)
    at Doc.emit (bundle.js:23511)
    at Doc._otApply (bundle.js:27357)
    at Doc._submit (bundle.js:27461)
    at Doc.submitOp (bundle.js:27562)
    at ShareDBCodeMirror.afterLocalChanges (bundle.js:25919)
    at ShareDBCodeMirror.codeMirrorChanges (bundle.js:25728)
    at signal (bundle.js:12762)
    at endOperation_finish (bundle.js:16102)

Start with the getDocPresence usage and the LocalDocPresence._transformAgainstOp stack entry shown in the error, then inspect how the document type is selected for this ShareDB connection. Reproduce the CodeMirror edit with presence enabled and confirm that edits no longer throw a transformPresence error.