App crashes due to TypeCastException in LoginFragment

[liveHarshit]

Describe the bug
App crashes due to typecasting of Serializable to List<Pair<Int, Int>>

To Reproduce

1. Register for a ticket after logout

Logs
Caused by: kotlin.TypeCastException: null cannot be cast to non-null type kotlin.collections.List<kotlin.Pair<kotlin.Int, kotlin.Int>> at org.fossasia.openevent.general.auth.LoginFragment.onCreate(LoginFragment.kt:38)

Smartphone Info:

Device	Mi Max 2
Android Version	Nougat 7.1

Would you like to work on the issue?

• Yes
• No
• Other:

[iamareebjamal]

Closed in #775