commit https://github.com/vim/vim/commit/13ddc5c35921efa69e980284117b6db6465e019c Author: Bram Moolenaar <Bram@vim.org> Date: Wed May 25 22:51:17 2016 +0200 patch 7.4.1847 Problem: Getting an item from a NULL dict crashes. Setting a register to a NULL list crashes. (Nikolai Pavlov, issue https://github.com/vim/vim/issues/768) Comparing a NULL dict with a NULL dict fails. Solution: Properly check for NULL.

the first targets to make vim are: scratch config myself
srcdir = .
VIMNAME = vim
EXNAME = ex
VIEWNAME = view