===================================================================
RCS file: /cvsrepo/anoncvs/cvs/src/usr.bin/tmux/grid.c,v
retrieving revision 1.28
retrieving revision 1.29
diff -u -r1.28 -r1.29
--- src/usr.bin/tmux/grid.c	2013/03/25 10:05:35	1.28
+++ src/usr.bin/tmux/grid.c	2013/03/25 10:07:40	1.29
@@ -1,4 +1,4 @@
-/* $OpenBSD: grid.c,v 1.28 2013/03/25 10:05:35 nicm Exp $ */
+/* $OpenBSD: grid.c,v 1.29 2013/03/25 10:07:40 nicm Exp $ */
 
 /*
  * Copyright (c) 2008 Nicholas Marriott <nicm@users.sourceforge.net>
@@ -595,7 +595,7 @@
 
 	GRID_DEBUG(gd, "px=%u, py=%u, nx=%u", px, py, nx);
 
-	if (*lastgc == NULL) {
+	if (lastgc != NULL && *lastgc == NULL) {
 		memcpy(&lastgc1, &grid_default_cell, sizeof lastgc1);
 		*lastgc = &lastgc1;
 	}