From a9585971c35799b06501fe5bba1cf584d000d27b Mon Sep 17 00:00:00 2001
From: Xiangtian Dai <xiangtian@google.com>
Date: Thu, 19 Oct 2017 08:58:36 -0700
Subject:  Silences unguarded availability warnings in Auth. (#389)

Also fixes a crash in the Auth sample app in an error case.

This addresses *Auth* part of #385 .
---
 Example/Auth/Sample/MainViewController.m | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'Example/Auth')

diff --git a/Example/Auth/Sample/MainViewController.m b/Example/Auth/Sample/MainViewController.m
index e885e5a..5e739b7 100644
--- a/Example/Auth/Sample/MainViewController.m
+++ b/Example/Auth/Sample/MainViewController.m
@@ -2537,7 +2537,9 @@ static NSDictionary<NSString *, NSString *> *parseURL(NSString *urlString) {
         if (error) {
           [self logFailure:@"failed to send verification code" error:error];
           [self showMessagePrompt:error.localizedDescription];
-          completion(error);
+          if (completion) {
+            completion(error);
+          }
           return;
         }
         [self logSuccess:@"Code sent"];
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