From fee4e39ca3fd8e3f5292f05f33cb9a213f318176 Mon Sep 17 00:00:00 2001
From: Jan Edmund Lazo <janedmundlazo@hotmail.com>
Date: Mon, 25 Jun 2018 11:34:21 -0400
Subject: [PATCH] vim-patch:8.0.0706: crash when cancelling the cmdline window
 in Ex mode

Problem:    Crash when cancelling the cmdline window in Ex mode. (James McCoy)
Solution:   Do not set cmdbuff to NULL, make it empty.
https://github.com/vim/vim/commit/5a15b6aa0aa5c1559c6f1a9f06c595a8c564637d
---
 src/nvim/ex_getln.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/nvim/ex_getln.c b/src/nvim/ex_getln.c
index 3372edb8fd..d152dfa271 100644
--- a/src/nvim/ex_getln.c
+++ b/src/nvim/ex_getln.c
@@ -6183,9 +6183,13 @@ static int open_cmdwin(void)
       ccline.cmdbuff = NULL;
     } else
       ccline.cmdbuff = vim_strsave(get_cursor_line_ptr());
-    if (ccline.cmdbuff == NULL)
+    if (ccline.cmdbuff == NULL) {
+      ccline.cmdbuff = vim_strsave((char_u *)"");
+      ccline.cmdlen = 0;
+      ccline.cmdbufflen = 1;
+      ccline.cmdpos = 0;
       cmdwin_result = Ctrl_C;
-    else {
+    } else {
       ccline.cmdlen = (int)STRLEN(ccline.cmdbuff);
       ccline.cmdbufflen = ccline.cmdlen + 1;
       ccline.cmdpos = curwin->w_cursor.col;