diff --git a/src/vim9class.c b/src/vim9class.c
index 2f24228..562db25 100644
--- a/src/vim9class.c
+++ b/src/vim9class.c
@@ -1509,6 +1509,9 @@
 
     class_T *cl = obj->obj_class;
 
+    if (!cl)
+        return;
+
     // the member values are just after the object structure
     typval_T *tv = (typval_T *)(obj + 1);
     for (int i = 0; i < cl->class_obj_member_count; ++i)