--- xterm-229/util.c.orig	2008-05-05 15:14:51.000000000 -0700
+++ xterm-229/util.c	2008-05-05 15:26:34.000000000 -0700
@@ -1657,6 +1657,8 @@ handle_translated_exposure(XtermWidget x
     int y0, y1;
     int result = 0;
 
+    assert(screen != NULL);
+
     TRACE(("handle_translated_exposure at %d,%d size %dx%d\n",
 	   rect_y, rect_x, rect_height, rect_width));
 
@@ -1681,7 +1683,10 @@ handle_translated_exposure(XtermWidget x
     if (toprow < 0)
 	toprow = 0;
 
-    leftcol = x0 / CurFontWidth(screen, screen->cur_row);
+    if ( (CurFontWidth(screen, screen->cur_row)) == 0 )
+        leftcol = 0;
+    else
+        leftcol = x0 / CurFontWidth(screen, screen->cur_row);
     if (leftcol < 0)
 	leftcol = 0;