patch 8.0.0859: NULL pointer access when term_free_vterm called twice commit https://github.com/vim/vim/commit/8e5eece8c5f22a2235edeb743d06253f6c54cfdc Author: Bram Moolenaar <Bram@vim.org> Date: Fri Aug 4 20:29:53 2017 +0200 patch 8.0.0859: NULL pointer access when term_free_vterm called twice Problem: NULL pointer access when term_free_vterm called twice. Solution: Return when tl_vterm is NULL. (Yasuhiro Matsumoto, closes https://github.com/vim/vim/issues/1934)