Can't show badge?

I got an issue, I add line "spaceNavigationView.showBadgeAtIndex(2,3,getResources().getColor(R.color.colorAccent));" to onCreate of Activity to show badge, so it ocour FC issue with log "java.lang.IndexOutOfBoundsException: Index: 2, Size: 0", through I've add 4 item before, what should i do?

Reproduce the call to spaceNavigationView.showBadgeAtIndex(2, 3, ...) from Activity.onCreate after adding four items, then inspect how that method accesses the navigation items. Done means the call no longer throws IndexOutOfBoundsException and the badge appears at the requested index.

Written by the indexing model from the issue text.