open-event-attendee-android: bug: Trying to enter Login screen twice crashes the app

Describe the bug Trying to enter Login screen twice crashes the app

To Reproduce

1. Go to Login page
2. Tap on Login in Bottom Nav again
3. App crashes

Expected behavior App does not crash

Screenshots

Crash log

2019-03-07 19:27:46.601 31803-31803/com.eventyay.attendee E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.eventyay.attendee, PID: 31803
    java.lang.IllegalStateException: Fragment LoginFragment{3bfb136 (8835c986-94ef-4728-ac33-e6a256da19f0) id=0x7f0800f4} has null arguments
        at org.fossasia.openevent.general.auth.LoginFragment$$special$$inlined$navArgs$1.invoke(FragmentNavArgsLazy.kt:42)
        at org.fossasia.openevent.general.auth.LoginFragment$$special$$inlined$navArgs$1.invoke(Unknown Source:0)
        at androidx.navigation.NavArgsLazy.getValue(NavArgsLazy.kt:44)
        at androidx.navigation.NavArgsLazy.getValue(NavArgsLazy.kt:34)
        at org.fossasia.openevent.general.auth.LoginFragment.getSafeArgs(Unknown Source:28)
        at org.fossasia.openevent.general.auth.LoginFragment.showSnackbar(LoginFragment.kt:214)
        at org.fossasia.openevent.general.auth.LoginFragment.onCreateView(LoginFragment.kt:60)
        at androidx.fragment.app.Fragment.performCreateView(Fragment.java:2530)
        at androidx.fragment.app.FragmentManagerImpl.moveToState(FragmentManagerImpl.java:887)
        at androidx.fragment.app.FragmentManagerImpl.addAddedFragments(FragmentManagerImpl.java:2090)
        at androidx.fragment.app.FragmentManagerImpl.executeOpsTogether(FragmentManagerImpl.java:1864)
        at androidx.fragment.app.FragmentManagerImpl.removeRedundantOperationsAndExecute(FragmentManagerImpl.java:1820)
        at androidx.fragment.app.FragmentManagerImpl.execPendingActions(FragmentManagerImpl.java:1721)
        at androidx.fragment.app.FragmentManagerImpl$1.run(FragmentManagerImpl.java:147)
        at android.os.Handler.handleCallback(Handler.java:873)
        at android.os.Handler.dispatchMessage(Handler.java:99)
        at android.os.Looper.loop(Looper.java:193)
        at android.app.ActivityThread.main(ActivityThread.java:6718)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)

Smartphone Info:

Device: Google Pixel OS: Android 9 Pie

Would you like to work on the issue? Yes