diff --git a/packages/share/CHANGELOG.md b/packages/share/CHANGELOG.md
index 7ac36c080c33..e10db5b351fc 100644
--- a/packages/share/CHANGELOG.md
+++ b/packages/share/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 0.6.3
+
+* Resolve a crash when not setting the subject variable and sharing to Mail.
+
 ## 0.6.2+2
 
 * Update and migrate iOS example project.
diff --git a/packages/share/ios/Classes/SharePlugin.m b/packages/share/ios/Classes/SharePlugin.m
index cfd8eac6876d..b6bcb784ff6e 100644
--- a/packages/share/ios/Classes/SharePlugin.m
+++ b/packages/share/ios/Classes/SharePlugin.m
@@ -31,7 +31,7 @@ + (void)registerWithRegistrar:(NSObject<FlutterPluginRegistrar> *)registrar {
       NSNumber *originWidth = arguments[@"originWidth"];
       NSNumber *originHeight = arguments[@"originHeight"];
 
-      CGRect originRect;
+      CGRect originRect = CGRectZero;
       if (originX != nil && originY != nil && originWidth != nil && originHeight != nil) {
         originRect = CGRectMake([originX doubleValue], [originY doubleValue],
                                 [originWidth doubleValue], [originHeight doubleValue]);
@@ -55,7 +55,9 @@ + (void)share:(id)sharedItems
   UIActivityViewController *activityViewController =
       [[UIActivityViewController alloc] initWithActivityItems:@[ sharedItems ]
                                         applicationActivities:nil];
-  [activityViewController setValue:subject forKey:@"subject"];
+  if (subject && ![subject isKindOfClass:[NSNull class]]) {
+    [activityViewController setValue:subject forKey:@"subject"];
+  }
   activityViewController.popoverPresentationController.sourceView = controller.view;
   if (!CGRectIsEmpty(origin)) {
     activityViewController.popoverPresentationController.sourceRect = origin;
diff --git a/packages/share/pubspec.yaml b/packages/share/pubspec.yaml
index d140fab114c5..fc11e713150c 100644
--- a/packages/share/pubspec.yaml
+++ b/packages/share/pubspec.yaml
@@ -3,7 +3,7 @@ description: Flutter plugin for sharing content via the platform share UI, using
   the ACTION_SEND intent on Android and UIActivityViewController on iOS.
 author: Flutter Team <flutter-dev@googlegroups.com>
 homepage: https://github.com/flutter/plugins/tree/master/packages/share
-version: 0.6.2+2
+version: 0.6.3
 
 flutter:
   plugin: