Fixed memory dereference error (#640)

permission_handler/CHANGELOG.md

+## 8.1.4+2
+
+* iOS: fixed memory error that occurred on iOS 12.2 and below (see issue [#638](https://github.com/Baseflow/flutter-permission-handler/issues/638)).
+
 ## 8.1.4+1
 ## 8.1.4+1
 
 
 * Fix a bug where after allowing the `location` permission and requesting it again would lead to a memory error.
 * Fix a bug where after allowing the `location` permission and requesting it again would lead to a memory error.

permission_handler/ios/Classes/PermissionManager.m

@@ -55,12 +55,16 @@
             [requestQueue removeObject:@(permission)];
             [requestQueue removeObject:@(permission)];
             
             
             [self->_strategyInstances removeObject:permissionStrategy];
             [self->_strategyInstances removeObject:permissionStrategy];
-            permissionStrategy = nil;
             
             
             if (requestQueue.count == 0) {
             if (requestQueue.count == 0) {
                 completion(permissionStatusResult);
                 completion(permissionStatusResult);
-                return;
             }
             }
+          
+            // Make sure `completion` is called before cleaning up the reference
+            // otherwise the `completion` block is also dereferenced on iOS 12 and
+            // below (this is most likely a bug in Objective-C which is solved in
+            // later versions of the runtime).
+            permissionStrategy = nil;
         }];
         }];
     }
     }
 }
 }

permission_handler/pubspec.yaml

 name: permission_handler
 name: permission_handler
 description: Permission plugin for Flutter. This plugin provides a cross-platform (iOS, Android) API to request and check permissions.
 description: Permission plugin for Flutter. This plugin provides a cross-platform (iOS, Android) API to request and check permissions.
-version: 8.1.4+1
+version: 8.1.4+2
 homepage: https://github.com/baseflowit/flutter-permission-handler
 homepage: https://github.com/baseflowit/flutter-permission-handler
 
 
 flutter:
 flutter: