coroutines exception handling

coroutines_exception

private val exceptionHandler = CoroutineExceptionHandler { _, exception ->
    LogHelper.log(TAG, "User Observer Exception: ${exception.stackTrace}", Log.ERROR)
}
private suspend fun userHasClientCodes(user : FirebaseUser, request: UsersRequest, token : String): String?  =
    withContext(Dispatchers.IO+ exceptionHandler) {
        
            val response = CustomerAreaAPI.createUser(request, "Bearer ${token}")
            if (response != null && response !is String) {
                if (AppPreferences.firstTimeNotification == 0) {
                    AppPreferences.firstTimeNotification = 1
                    sendNotificationToken(AppPreferences.notificationToken, baseContext)
                }
                var data = (response as ServerResponse<UsersResponse>).data
                if (data!!.customerCodes.isNullOrEmpty()) {
                    return@withContext "false"
                }
                return@withContext "true"
            }
            return@withContext response as? String
    }