Docs don't show resolveDependees

[rhlsthrm]

The docs do not show an example of resolveDependees. I am getting an error when trying to create a resolver the following way:

const poolShareValue = pipeResolvers(
  resolveDependees(['totalPoolShares', 'poolValue']),
  ([totalPoolShares, poolValue]) => {
    const ethPerShare = totalPoolShares.toNumber() > 0 ? parseFloat(utils.formatEther(poolValue)) / totalPoolShares.toNumber() : 0; // in eth
    const value = utils.parseEther(ethPerShare.toString()); // in wei
    return value
  }
)

When I tried to set poolShareValue as a resolver, my app throws an error:

Uncaught Error: Error!: Error: Network error: Cannot read property '_fields' of undefined
    at Object.children (Pool.js:129)
    at finish (react-apollo.esm.js:434)
    at Query.render (react-apollo.esm.js:441)
    at finishClassComponent (react-dom.development.js:15320)
    at updateClassComponent (react-dom.development.js:15275)
    at beginWork (react-dom.development.js:16265)
    at performUnitOfWork (react-dom.development.js:20285)
    at workLoop (react-dom.development.js:20326)
    at HTMLUnknownElement.callCallback (react-dom.development.js:147)
    at Object.invokeGuardedCallbackDev (react-dom.development.js:196)
    at invokeGuardedCallback (react-dom.development.js:250)
    at replayUnitOfWork (react-dom.development.js:19509)
    at renderRoot (react-dom.development.js:20439)
    at performWorkOnRoot (react-dom.development.js:21363)
    at performWork (react-dom.development.js:21273)
    at performSyncWork (react-dom.development.js:21247)
    at requestWork (react-dom.development.js:21102)
    at scheduleWork (react-dom.development.js:20915)
    at Object.enqueueForceUpdate (react-dom.development.js:11633)
    at Query.push../node_modules/react/cjs/react.development.js.Component.forceUpdate (react.development.js:355)