From 7b56497963fdddbd5150888ec4d422aea91a1307 Mon Sep 17 00:00:00 2001
From: thrust26 <tjentzsch@yahoo.de>
Date: Fri, 31 May 2019 16:26:52 +0200
Subject: [PATCH] fix crash when TM is disabled

---
 src/common/RewindManager.cxx | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/common/RewindManager.cxx b/src/common/RewindManager.cxx
index cb52212a2..021fc0350 100644
--- a/src/common/RewindManager.cxx
+++ b/src/common/RewindManager.cxx
@@ -223,6 +223,9 @@ uInt32 RewindManager::windStates(uInt32 numStates, bool unwind)
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 string RewindManager::saveAllStates()
 {
+  if (getLastIdx() == 0)
+    return "Nothing to save";
+
   try
   {
     ostringstream buf;