From 6d5d4e7c24db3d5d5f33863b6b23304c80ae7756 Mon Sep 17 00:00:00 2001
From: Enrico Turri <enricoturri@seznam.cz>
Date: Tue, 23 Oct 2018 09:48:01 +0200
Subject: [PATCH] Fixed exception when closing Slic3r

---
 src/slic3r/GUI/Tab.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/slic3r/GUI/Tab.cpp b/src/slic3r/GUI/Tab.cpp
index d4249ea23b..55aeaa234d 100644
--- a/src/slic3r/GUI/Tab.cpp
+++ b/src/slic3r/GUI/Tab.cpp
@@ -2426,10 +2426,13 @@ void Tab::OnTreeSelChange(wxTreeEvent& event)
 	wxWindowUpdateLocker noUpdates(this);
 #endif
 
+    if (m_pages.empty())
+        return;
+
 	Page* page = nullptr;
     const auto sel_item = m_treectrl->GetSelection();
     const auto selection = sel_item ? m_treectrl->GetItemText(sel_item) : "";
-	for (auto p : m_pages)
+    for (auto p : m_pages)
 		if (p->title() == selection)
 		{
 			page = p.get();