diff --git a/platform-darwin/Source/MPAppDelegate_Store.m b/platform-darwin/Source/MPAppDelegate_Store.m
index 25cf8f95..f71e3942 100644
--- a/platform-darwin/Source/MPAppDelegate_Store.m
+++ b/platform-darwin/Source/MPAppDelegate_Store.m
@@ -51,6 +51,8 @@ PearlAssociatedObjectProperty( NSNumber*, StoreCorrupted, storeCorrupted );
 
 + (NSManagedObjectContext *)managedObjectContextForMainThreadIfReady {
 
+    NSAssert( [[NSThread currentThread] isMainThread], @"Direct access to main MOC only allowed from the main thread." );
+
     NSManagedObjectContext *mainManagedObjectContext = [[self get] mainManagedObjectContextIfReady];
     if (!mainManagedObjectContext || ![[NSThread currentThread] isMainThread])
         return nil;
@@ -154,8 +156,6 @@ PearlAssociatedObjectProperty( NSNumber*, StoreCorrupted, storeCorrupted );
 
 - (NSManagedObjectContext *)mainManagedObjectContextIfReady {
 
-    NSAssert( [[NSThread currentThread] isMainThread], @"Can only access main MOC from the main thread." );
-
     [self loadStore];
 
     if (!self.mainManagedObjectContext && self.privateManagedObjectContext.persistentStoreCoordinator) {