react-native: NSNull Length exception thrown while invoking multiSet on target AsyncLocalStorage - unhandled exception crashes app on iOS

Is this a bug report?

Yes

Have you read the Contributing Guidelines?

Yes

Environment

Environment: OS: Win 10 1703 OS Build: 15063.674 Node: 4.6.1 Yarn: – npm: 5.5.1 Watchman: – Xcode: – Android Studio: –

"expo": "^22.0.2",
"react": "16.0.0-beta.5",
"react-native": "^0.49.5",
"react-native-auth0": "^1.2.1",
"react-native-canvas": "^0.1.20",
"react-native-maps": "^0.17.1",
"react-navigation": "^1.0.0-beta.19"

Target Platform: iOS (11)

Steps to Reproduce

NSNull unhandled exception leading to total application crash when attempting to call AsyncStorage.setItem(‘justAString’).

Cannot try/catch/finally to prevent crash, suggest adding exception handler.

Expected Behavior

An error message should have been thrown with the promise associated with setItem.

Actual Behavior

Expo displays this exception and stack trace for less than a second before crashing the Expo instance.

Reproducible Demo

import React, { Component } from 'react';
import { AsyncStorage } from 'react-native';

replaceLocal('StringParam')

export async function replaceLocal(key,newObj){
    try {
        let stringObject = JSON.stringify(newObj)
        AsyncStorage.setItem(key,stringObject)
    } catch (error) {
        console.log(error)
    }
}