From 8c43b049705b98248a0becc7ecef5676345c54f3 Mon Sep 17 00:00:00 2001
From: YuSanka <yusanka@gmail.com>
Date: Wed, 4 Sep 2019 14:37:09 +0200
Subject: [PATCH] Fixed debug crash in update_changed_tree_ui

Reproduce: For MK2.5S printer preset set flag "Support stealth mode"
---
 src/slic3r/GUI/Tab.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/slic3r/GUI/Tab.cpp b/src/slic3r/GUI/Tab.cpp
index 6e6fcf50c..d9cf56f03 100644
--- a/src/slic3r/GUI/Tab.cpp
+++ b/src/slic3r/GUI/Tab.cpp
@@ -545,6 +545,9 @@ void TabSLAMaterial::init_options_list()
 void Tab::get_sys_and_mod_flags(const std::string& opt_key, bool& sys_page, bool& modified_page)
 {
     auto opt = m_options_list.find(opt_key);
+    if (opt == m_options_list.end()) 
+        return;
+
     if (sys_page) sys_page = (opt->second & osSystemValue) != 0;
     modified_page |= (opt->second & osInitValue) == 0;
 }