LIFF getFriendship sometime catch error but only return empty object

Question

### Pre condition, Condition to reproduce
When I try to get friendship status and if 'friendFlag === false' then redirect to add friend page
sometime it catch and return object Error{}
this error occur 20/03/2021, I think
this project finished around 10/2020
It never happend before

### Issue/ Error Message details
This only happen in LINE android not Desktop (not sure about IOS)
Error{}

### Accompanying respective source code
initLiff = async (decodedToken) => {
    console.log('initLiff')
    if (decodedToken.liffId) {
      try {
        await liff.init({ liffId: decodedToken.liffId })

        const error = this.props.error
        if (error === 'access_denied') {
          liff.closeWindow()
        }

        if (error) {
          console.log('initLiff error')
          return this.setState({ isError: true })
        }

        const isLoggedIn = liff.isLoggedIn()
        console.log('isLoggedIn', isLoggedIn)
        if (!isLoggedIn) {
          return this.redirectLogin()
        }

				// this is where error happend
        const isFriend = await liff.getFriendship()
        if (!isFriend.friendFlag) {
          return this.redirectLogin()
        }

        this.getAccessToken(decodedToken)
      } catch (e) {
        this.setState({ isError: true })
      }
    } else {
      this.setState({ isError: true })
    }
  }

### Resolution Tried
originally I use @line/liff 2.4.1 and I upgrade to 2.8.1 It won't help

if I remove liff.getFriendship() completely error never occur

I console.log and try to remove everything at a time still don't get anything useful
So I think cause by liff.getFriendship()


### Reference information (Version / Platform/ environment)
@line/liff 2.4.1

web develop with preact-cli 3.0.0

System: Android 9
UA: Mozilla/5.0 (Linux; Android 9; Redmi Note 6 Pro Build/PKQ1.180904.001; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/89.0.4389.105 Mobile Safari/537.36 Line/11.4.1 LIFF

Shoya Shiraki · Answer

It seems LIFF API outage.

[https://developers.line.biz/en/news/2021/03/23/liff-outage/](https://developers.line.biz/en/news/2021/03/23/liff-outage/)

Q&A

LIFF getFriendship sometime catch error but only return empty object

Pre condition, Condition to reproduce

Issue/ Error Message details

Accompanying respective source code

Resolution Tried

Reference information (Version / Platform/ environment)