From 5b4cf5474da13e0f92dbc0a860cf6ebc0c55c282 Mon Sep 17 00:00:00 2001
From: James Montemagno <james.montemagno@gmail.com>
Date: Thu, 30 May 2019 19:18:13 -0700
Subject: [PATCH] Add mroe null checks in LocationAuthCallback Should Fix #740
 (#748)

---
 Xamarin.Essentials/Permissions/Permissions.ios.cs | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/Xamarin.Essentials/Permissions/Permissions.ios.cs b/Xamarin.Essentials/Permissions/Permissions.ios.cs
index e4a9c48..d22d920 100644
--- a/Xamarin.Essentials/Permissions/Permissions.ios.cs
+++ b/Xamarin.Essentials/Permissions/Permissions.ios.cs
@@ -95,12 +95,14 @@ namespace Xamarin.Essentials
 
             void LocationAuthCallback(object sender, CLAuthorizationChangedEventArgs e)
             {
-                if (e.Status == CLAuthorizationStatus.NotDetermined)
+                if (e?.Status == null || e.Status == CLAuthorizationStatus.NotDetermined)
                     return;
 
-                locationManager.AuthorizationChanged -= LocationAuthCallback;
-                tcs.TrySetResult(GetLocationStatus());
-                locationManager.Dispose();
+                if (locationManager != null)
+                    locationManager.AuthorizationChanged -= LocationAuthCallback;
+
+                tcs?.TrySetResult(GetLocationStatus());
+                locationManager?.Dispose();
                 locationManager = null;
             }
         }