Remove a bogus assertion.
diff --git a/vm/Sync.c b/vm/Sync.c
index 595f9db..47edd0d 100644
--- a/vm/Sync.c
+++ b/vm/Sync.c
@@ -315,7 +315,6 @@
     Object *obj;
 
     assert(mon != NULL);
-    assert(*mon != NULL);
     assert(isUnmarkedObject != NULL);
     prev = &handle;
     prev->next = curr = *mon;