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)

--- a/src/screen.c
+++ b/src/screen.c
@@ -8127,7 +8127,7 @@ screen_start_highlight(int attr)
 			term_bg_color(aep->ae_u.cterm.bg_color - 1);
 		}
 
-		if (t_colors <= 1)
+		if (!IS_CTERM)
 		{
 		    if (aep->ae_u.term.start != NULL)
 			out_str(aep->ae_u.term.start);