diff -c src/charset.c.orig src/charset.c
*** src/charset.c.orig	Sat Sep 26 09:09:19 2009
--- src/charset.c	Sat Sep 26 09:09:27 2009
***************
*** 1218,1223 ****
--- 1218,1225 ----
      if ((int)vcol == width1 - 1)
  	return TRUE;
      width2 = width1 + win_col_off2(wp);
+     if (width2 == 0)
+ 	return FALSE;
      return ((vcol - width1) % width2 == width2 - 1);
  }
  #endif /* FEAT_MBYTE */