Unhandled rejection TypeError: Cannot read property 'parent' of undefined

Question

at Function.exports.update (d:\node\pachong\node_modules\cheerio\lib\parse.js:69:26)

at module.exports (d:\node\pachong\node_modules\cheerio\lib\parse.js:19:11)

at Function.exports.load (d:\node\pachong\node_modules\cheerio\lib\static.js:27:14)

at filterchapter (d:\node\pachong\promise_crawler.js:9:16)

at d:\node\pachong\promise_crawler.js:100:15

at Array.forEach (<anonymous>)

at d:\node\pachong\promise_crawler.js:99:8

at tryCatcher (d:\node\pachong\node_modules\bluebird\js\release\util.js:16:23)

at Promise._settlePromiseFromHandler (d:\node\pachong\node_modules\bluebird\js\release\promise.js:512:31)

at Promise._settlePromise (d:\node\pachong\node_modules\bluebird\js\release\promise.js:569:18)

at Promise._settlePromise0 (d:\node\pachong\node_modules\bluebird\js\release\promise.js:614:10)

at Promise._settlePromises (d:\node\pachong\node_modules\bluebird\js\release\promise.js:693:18)

at Promise._fulfill (d:\node\pachong\node_modules\bluebird\js\release\promise.js:638:18)

at PromiseArray._resolve (d:\node\pachong\node_modules\bluebird\js\release\promise_array.js:126:19)

at PromiseArray._promiseFulfilled (d:\node\pachong\node_modules\bluebird\js\release\promise_array.js:144:14)

at Promise._settlePromise (d:\node\pachong\node_modules\bluebird\js\release\promise.js:574:26)