patch 8.0.0486: crash and endless loop when closing windows in autocmd commit https://github.com/vim/vim/commit/8c752bd6c4af54c0b7bac35a39acc2bf16015f85 Author: Bram Moolenaar <Bram@vim.org> Date: Sun Mar 19 17:09:56 2017 +0100 patch 8.0.0486: crash and endless loop when closing windows in autocmd Problem: Crash and endless loop when closing windows in a SessionLoadPost autocommand. Solution: Check for valid tabpage. (partly neovim #6308)

--- a/src/fileio.c
+++ b/src/fileio.c
@@ -9033,6 +9033,11 @@ win_found:
 	win_remove(curwin, NULL);
 	aucmd_win_used = FALSE;
 	last_status(FALSE);	    /* may need to remove last status line */
+
+	if (!valid_tabpage_win(curtab))
+	    /* no valid window in current tabpage */
+	    close_tabpage(curtab);
+
 	restore_snapshot(SNAP_AUCMD_IDX, FALSE);
 	(void)win_comp_pos();   /* recompute window positions */
 	unblock_autocmds();