TypeError: TypeError: t.username.toUpperCase is not a function

Sentry Issue: MOBILE-JP

TypeError: TypeError: t.username.toUpperCase is not a function. (In 't.username.toUpperCase()', 't.username.toUpperCase' is undefined)

This error is located at:
    in p
    in RCTView
    in s
    in RCTScrollContentView
    in RCTScrollView
    in c
    in c
    in n
    in RCTView
    in n
    in inject-n-with-messengerList
    in p
    in C
    in p
    in RCTView
    in RCTScrollContentView
    in RCTScrollView
    in c
    in p
    in RCTView
    in RCTView
    in h
    in x
    in v
    in P
    in c
    in p
    in C
    in p
    in RCTView
    in s
    in RNSScreen
    in s
    in h
    in y
    in E
    in RNSScreenContainer
    in n
    in RCTView
    in s
    in PanGestureHandler
    in b
    in p
    in RCTView
    in P
    in S
    in P
    in h
    in k
    in p
    in n
    in A
    in RCTView
    in RCTView
    in o
  File "src/messenger/conversation/ConversationView.js", line 41, in value
    <Text style={styles.body}>{item.username.toUpperCase()}</Text>
  File "src/messenger/MessengerListStore.js", line 150
    this.offset = response.offset;
...
(33 additional frame(s) were not displayed)