App crashes while selecting +61 Country code

[nihal-dukka]

The app crashes on selecting +61 country code in iOS, Attaching the logs for reference.

`warning: libphonenumber_plugin was compiled with optimization - stepping may behave oddly; variables may not be available.

• thread FlutterSimCountryCode.simCountryCode : "Reply already submitted" on Android #1, queue = 'com.apple.main-thread', stop reason = Swift runtime failure: Unexpectedly found nil while implicitly unwrapping an Optional value
  frame FlutterSimCountryCode.simCountryCode : "Reply already submitted" on Android #1: 0x0000000104325d50 libphonenumber_pluginspecialized SwiftLibphonenumberPlugin.getRegionInfo(call=<unavailable>) at SwiftLibphonenumberPlugin.swift:93:50 [opt] 90 do { 91 let p : NBPhoneNumber = try phoneUtils.parse(phoneNumber, defaultRegion: isoCode.uppercased()) 92 -> 93 let regionCode : String = phoneUtils.getRegionCode(for: p) ^ 94 let countryCode : String = p.countryCode.stringValue as String 95 let formattedNumber : String = try phoneUtils.format(p, numberFormat: NBEPhoneNumberFormat.NATIONAL) 96 Target 0: (Runner) stopped.