# HG changeset patch
# User Christian Brabandt <cb@256bit.org>
# Date 1695148207 -7200
# Node ID 4cb421ba3385d493bd8add63e439f480183fa9c7
# Parent  9a7b1f8aea55d6dda6d578f54d5c6beafbc409aa
patch 9.0.1911: Vim9: segfault with null object and instanceof()

Commit: https://github.com/vim/vim/commit/3da696db6ac6103eb8f07cf7be23fa0e12c2419d
Author: Ernie Rael <errael@raelity.com>
Date:   Tue Sep 19 20:14:18 2023 +0200

    patch 9.0.1911: Vim9: segfault with null object and instanceof()

    Problem:  Vim9: segfault with null object and instanceof()
    Solution: return early

    closes: #13121

    Signed-off-by: Christian Brabandt <cb@256bit.org>
    Co-authored-by: Ernie Rael <errael@raelity.com>

diff --git a/src/testdir/test_vim9_class.vim b/src/testdir/test_vim9_class.vim
--- a/src/testdir/test_vim9_class.vim
+++ b/src/testdir/test_vim9_class.vim
@@ -3032,6 +3032,10 @@ def Test_instanceof()
       assert_true(instanceof(a3, [Base1, Base2, Intf1]))
     enddef
     Foo()
+
+    var o_null: Base1
+    assert_false(instanceof(o_null, Base1))
+
   END
   v9.CheckSourceSuccess(lines)
 enddef
diff --git a/src/version.c b/src/version.c
--- a/src/version.c
+++ b/src/version.c
@@ -700,6 +700,8 @@ static char *(features[]) =
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1911,
+/**/
     1910,
 /**/
     1909,
diff --git a/src/vim9class.c b/src/vim9class.c
--- a/src/vim9class.c
+++ b/src/vim9class.c
@@ -2865,6 +2865,9 @@ f_instanceof(typval_T *argvars, typval_T
 	    || check_for_class_or_list_arg(argvars, 1) == FAIL)
 	return;
 
+    if (object_tv->vval.v_object == NULL)
+	return;
+
     if (classinfo_tv->v_type == VAR_LIST)
     {
 	FOR_ALL_LIST_ITEMS(classinfo_tv->vval.v_list, li)