diff --git a/platform-darwin/Source/iOS/MPiOSAppDelegate.m b/platform-darwin/Source/iOS/MPiOSAppDelegate.m
index 0d8f07a6..165ebd5d 100644
--- a/platform-darwin/Source/iOS/MPiOSAppDelegate.m
+++ b/platform-darwin/Source/iOS/MPiOSAppDelegate.m
@@ -132,7 +132,9 @@ MP_LIBS_END
             [self updateConfigKey:note.object];
         } );
         PearlAddNotificationObserver( NSUserDefaultsDidChangeNotification, nil, nil, ^(id self, NSNotification *note) {
-            [[NSNotificationCenter defaultCenter] postNotificationName:MPCheckConfigNotification object:nil];
+            PearlMainQueueOperation( ^{
+                [[NSNotificationCenter defaultCenter] postNotificationName:MPCheckConfigNotification object:nil];
+            } );
         } );
     }
     @catch (id exception) {