===================================================================
RCS file: /cvsrepo/anoncvs/cvs/src/usr.bin/tmux/cmd-command-prompt.c,v
retrieving revision 1.4
retrieving revision 1.5
diff -c -r1.4 -r1.5
*** src/usr.bin/tmux/cmd-command-prompt.c	2009/07/17 06:13:27	1.4
--- src/usr.bin/tmux/cmd-command-prompt.c	2009/07/20 07:31:10	1.5
***************
*** 1,4 ****
! /* $OpenBSD: cmd-command-prompt.c,v 1.4 2009/07/17 06:13:27 nicm Exp $ */
  
  /*
   * Copyright (c) 2008 Nicholas Marriott <nicm@users.sourceforge.net>
--- 1,4 ----
! /* $OpenBSD: cmd-command-prompt.c,v 1.5 2009/07/20 07:31:10 nicm Exp $ */
  
  /*
   * Copyright (c) 2008 Nicholas Marriott <nicm@users.sourceforge.net>
***************
*** 140,145 ****
--- 140,147 ----
  			}
  		}
  
+ 		if (buf == NULL)
+ 			return (0);
  		buf[len] = '\0';
  		s = buf;
  	}