From 92c6b7a632cb6f380802114abcb4739fd0029261 Mon Sep 17 00:00:00 2001
From: Mikko Rasa <tdb@tdb.fi>
Date: Sun, 4 May 2014 20:36:44 +0300
Subject: [PATCH] Avoid crash in SlopeTool if nothing is selected

---
 source/designer/slopetool.cpp | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/source/designer/slopetool.cpp b/source/designer/slopetool.cpp
index d4a6ffb..ef96e55 100644
--- a/source/designer/slopetool.cpp
+++ b/source/designer/slopetool.cpp
@@ -9,6 +9,13 @@ SlopeTool::SlopeTool(Designer &d, Input::Keyboard &k, Input::Mouse &m, const set
 	Tool(d, k, m),
 	total_length(0)
 {
+	if(objects.empty())
+	{
+		set_status("Nothing selected");
+		set_done(false);
+		return;
+	}
+
 	for(set<Object *>::const_iterator i=objects.begin(); i!=objects.end(); ++i)
 		if(!dynamic_cast<Track *>(*i) || (*i)->get_n_link_slots()!=2)
 		{
-- 
2.43.0