patch 8.2.1939: invalid memory access in Ex mode with global command Commit: https://github.com/vim/vim/commit/3b6d57f2ce87dc5a4b1a50e1b0fd2aeaf72faae2 Author: Bram Moolenaar <Bram@vim.org> Date: Sun Nov 1 21:56:40 2020 +0100 patch 8.2.1939: invalid memory access in Ex mode with global command Problem: Invalid memory access in Ex mode with global command. Solution: Make sure the cursor is on a valid line. (closes https://github.com/vim/vim/issues/7238)

--- a/src/move.c
+++ b/src/move.c
@@ -196,6 +196,7 @@ update_topline(void)
     // the cursor line.
     if (!screen_valid(TRUE) || curwin->w_height == 0)
     {
+	check_cursor_lnum();
 	curwin->w_topline = curwin->w_cursor.lnum;
 	curwin->w_botline = curwin->w_topline;
 	curwin->w_valid |= VALID_BOTLINE|VALID_BOTLINE_AP;