From a4bc2dd7cccf5a4a9f78b58b6f35a45d17164323 Mon Sep 17 00:00:00 2001
From: Bram Moolenaar <Bram@vim.org>
Date: Thu, 27 Jan 2022 19:27:16 +0000
Subject: [PATCH] patch 8.2.4233: crash when recording and using Select mode

Problem:    Crash when recording and using Select mode.
Solution:   When deleting the last recorded character check there is something
            to delete.
---
 src/getchar.c                  | 5 ++++-
 src/testdir/test_registers.vim | 9 +++++++++
 src/version.c                  | 2 ++
 3 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/src/getchar.c b/src/getchar.c
index c0dfc2b0b8997..49eb3d7df9e86 100644
--- a/src/getchar.c
+++ b/src/getchar.c
@@ -252,8 +252,11 @@ add_buff(
     static void
 delete_buff_tail(buffheader_T *buf, int slen)
 {
-    int len = (int)STRLEN(buf->bh_curr->b_str);
+    int len;
 
+    if (buf->bh_curr == NULL || buf->bh_curr->b_str == NULL)
+	return;  // nothing to delete
+    len = (int)STRLEN(buf->bh_curr->b_str);
     if (len >= slen)
     {
 	buf->bh_curr->b_str[len - slen] = NUL;
diff --git a/src/testdir/test_registers.vim b/src/testdir/test_registers.vim
index bbc7c1911d2bd..89d9d7cad7c46 100644
--- a/src/testdir/test_registers.vim
+++ b/src/testdir/test_registers.vim
@@ -739,6 +739,15 @@ func Test_record_in_insert_mode()
   bwipe!
 endfunc
 
+func Test_record_in_select_mode()
+  new
+  call setline(1, 'text')
+  sil norm q00
+  sil norm q
+  call assert_equal('0ext', getline(1))
+  bwipe!
+endfunc
+
 " Make sure that y_append is correctly reset
 " and the previous register is working as expected
 func Test_register_y_append_reset()
diff --git a/src/version.c b/src/version.c
index 2f872e98110e4..bc956cee0a66a 100644
--- a/src/version.c
+++ b/src/version.c
@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    4233,
 /**/
     4232,
 /**/