From 35e6e895bf4c7d2328531dfa374294ce9aba67f8 Mon Sep 17 00:00:00 2001
From: Gav Wood <i@gavwood.com>
Date: Mon, 13 Oct 2014 11:11:18 +0300
Subject: [PATCH] Minor crash fix.

---
 alethzero/MainWin.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/alethzero/MainWin.cpp b/alethzero/MainWin.cpp
index 249f3b4cc..8d69727f8 100644
--- a/alethzero/MainWin.cpp
+++ b/alethzero/MainWin.cpp
@@ -1740,9 +1740,9 @@ void Main::on_debugStepBack_triggered()
 
 void Main::on_debugStepBackOut_triggered()
 {
-	if (ui->debugTimeline->value() > 0)
+	if (ui->debugTimeline->value() > 0 && m_history.size() > 0)
 	{
-		auto ls = m_history[ui->debugTimeline->value()].levels.size();
+		auto ls = m_history[min(ui->debugTimeline->value(), m_history.size() - 1)].levels.size();
 		int l = ui->debugTimeline->value();
 		for (; l > 0 && m_history[l].levels.size() >= ls; --l) {}
 		ui->debugTimeline->setValue(l);