Node.js crash: Cannot read property 'key' of undefined

Steps to reproduce the bug:

Unclear

Crash reports from npm run psdr:

App: se.manyver 0.2002.4-beta-googlePlay (80)
Device: motorola moto x4 (arm64-v8a | armeabi-v7a | armeabi)
OS: Android 9 (SDK 28)
User comment: 

Stack trace from Node.js:
Cannot read property 'key' of undefined
TypeError: Cannot read property 'key' of undefined
    at /data/data/se.manyver/files/nodejs-project/index.js:27588:367
    at /data/data/se.manyver/files/nodejs-project/index.js:70730:24
    at /data/data/se.manyver/files/nodejs-project/index.js:26544:9
    at /data/data/se.manyver/files/nodejs-project/index.js:83263:20
    at /data/data/se.manyver/files/nodejs-project/index.js:27508:25
    at /data/data/se.manyver/files/nodejs-project/index.js:47659:9
    at /data/data/se.manyver/files/nodejs-project/index.js:2253:15
    at Array.unboxerMap (/data/data/se.manyver/files/nodejs-project/index.js:74957:35)
    at chainMaps (/data/data/se.manyver/files/nodejs-project/index.js:74962:14)
    at /data/data/se.manyver/files/nodejs-project/index.js:46321:14