patch 8.0.1600: crash when setting t_Co to zero when 'termguicolors' is set commit https://github.com/vim/vim/commit/f708ac592f47100a36f2bc12ec98ea6357fdfa27 Author: Bram Moolenaar <Bram@vim.org> Date: Mon Mar 12 21:48:32 2018 +0100 patch 8.0.1600: crash when setting t_Co to zero when 'termguicolors' is set Problem: Crash when setting t_Co to zero when 'termguicolors' is set. Solution: Use IS_CTERM instead of checking the number of colors. (closes #2710)