commit 908be438794619f10ef7fa25e24e5893b2ae0189
author Bram Moolenaar <Bram@vim.org> Tue May 24 10:51:30 2016 +0200
committer Bram Moolenaar <Bram@vim.org> Tue May 24 10:51:30 2016 +0200
tree 24528529e9fe0191ffc5d9988ae32ab9b610f456
parent 2ff8b64679242e73248774a388d54931c9ce49bd

patch 7.4.1834
Problem:    Possible crash when conceal is active.
Solution:   Check for the screen to be valid when redrawing a line.

src/screen.c

diff --git a/src/screen.c b/src/screen.c
index a72bffa..2e425cb 100644
--- a/src/screen.c
+++ b/src/screen.c
@@ -801,6 +801,10 @@
     int		row;
     int		j;
 
+    /* Don't do anything if the screen structures are (not yet) valid. */
+    if (!screen_valid(TRUE))
+	return;
+
     if (lnum >= wp->w_topline && lnum < wp->w_botline
 				 && foldedCount(wp, lnum, &win_foldinfo) == 0)
     {