diff --git a/src/testdir/test_vim9_class.vim b/src/testdir/test_vim9_class.vim
index c363cf0..a043f8c 100644
--- a/src/testdir/test_vim9_class.vim
+++ b/src/testdir/test_vim9_class.vim
@@ -10502,6 +10502,20 @@
     assert_equal(true, result)
   END
   v9.CheckScriptSuccess(lines)
+
+  lines =<< trim END
+    vim9script
+
+    class C
+        public var nest: C
+    endclass
+    var o1 = C.new()
+    var o2 = C.new(C.new())
+
+    var result = o1 == o2
+    assert_equal(false, result)
+  END
+  v9.CheckScriptSuccess(lines)
 enddef
 
 " Test for using a compound operator from a lambda function in an object method
diff --git a/src/version.c b/src/version.c
index 391ac73..357f9c1 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    515,
+/**/
     514,
 /**/
     513,
diff --git a/src/vim9class.c b/src/vim9class.c
index 4d0b4e8..5d68459 100644
--- a/src/vim9class.c
+++ b/src/vim9class.c
@@ -3855,6 +3855,8 @@
 
     if (o1 == o2)
 	return TRUE;
+    if (o1 == NULL || o2 == NULL)
+	return FALSE;
 
     cl1 = o1->obj_class;
     cl2 = o2->obj_class;