@@ -42,10 +42,13 @@
 #endif
 
 int
 objc_sync_enter(id object)
 {
+	if (object == nil)
+		return 0;
+
 #ifdef OF_HAVE_THREADS
 	struct lock_s *lock;
 
 	if (!of_mutex_lock(&mutex))
 		OBJC_ERROR("Failed to lock mutex!");
@@ -90,10 +93,13 @@
 }
 
 int
 objc_sync_exit(id object)
 {
+	if (object == nil)
+		return 0;
+
 #ifdef OF_HAVE_THREADS
 	struct lock_s *lock, *last = NULL;
 
 	if (!of_mutex_lock(&mutex))
 		OBJC_ERROR("Failed to lock mutex!");