From d13dd30240e32071210f55b587182ff48757ea46 Mon Sep 17 00:00:00 2001
From: Bram Moolenaar <Bram@vim.org>
Date: Sat, 11 Mar 2023 20:56:35 +0000
Subject: [PATCH] patch 9.0.1402: crash when using null_class

Problem:    Crash when using null_class.
Solution:   Give an error when trying to use a null class.
---
 src/testdir/test_vim9_class.vim | 7 +++++++
 src/version.c                   | 2 ++
 src/vim9class.c                 | 6 ++++++
 3 files changed, 15 insertions(+)

diff --git a/src/testdir/test_vim9_class.vim b/src/testdir/test_vim9_class.vim
index bc8a8e1d5..4b6a730bb 100644
--- a/src/testdir/test_vim9_class.vim
+++ b/src/testdir/test_vim9_class.vim
@@ -203,6 +203,13 @@ def Test_returning_null_object()
   v9.CheckScriptSuccess(lines)
 enddef
 
+def Test_using_null_class()
+  var lines =<< trim END
+      @_ = null_class.member
+  END
+  v9.CheckDefExecAndScriptFailure(lines, ['E715:', 'E1363:'])
+enddef
+
 def Test_class_interface_wrong_end()
   var lines =<< trim END
       vim9script
diff --git a/src/version.c b/src/version.c
index 0265c47a9..2dca10db9 100644
--- a/src/version.c
+++ b/src/version.c
@@ -695,6 +695,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1402,
 /**/
     1401,
 /**/
diff --git a/src/vim9class.c b/src/vim9class.c
index 74664f1b2..817435138 100644
--- a/src/vim9class.c
+++ b/src/vim9class.c
@@ -1262,6 +1262,12 @@ class_object_index(
 	cl = rettv->vval.v_object->obj_class;
     }
 
+    if (cl == NULL)
+    {
+	emsg(_(e_incomplete_type));
+	return FAIL;
+    }
+
     if (*name_end == '(')
     {
 	int on_class = rettv->v_type == VAR_CLASS;
-- 
2.40.0