From 57653d5cdfe7cee135bbb6cfaa2e5a4e233cd3bd Mon Sep 17 00:00:00 2001
From: Jonathan Moore Liles <j.liles@unix.net>
Date: Mon, 21 Jul 2014 22:31:10 -0700
Subject: [PATCH] Timeline: Don't die when undo function is used when no
 project is open or when there is nothing left to undo.

---
 nonlib/Loggable.C | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/nonlib/Loggable.C b/nonlib/Loggable.C
index bf50335..a815fc8 100644
--- a/nonlib/Loggable.C
+++ b/nonlib/Loggable.C
@@ -484,6 +484,10 @@ Loggable::do_this ( const char *s, bool reverse )
 void
 Loggable::undo ( void )
 {
+    if ( ! _fp ||                                               /* journal not open */
+         1 == _undo_offset )                                    /* nothing left to undo */
+        return;
+
     char *buf;
 
     block_start();