From 09c9f567f23c8c9248759ee71adcb902fbbdba38 Mon Sep 17 00:00:00 2001
From: Vojtech Kral <vojtech@kral.hk>
Date: Mon, 11 Mar 2019 13:59:58 +0100
Subject: [PATCH] Fix crash on exit

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

diff --git a/src/slic3r/GUI/Tab.cpp b/src/slic3r/GUI/Tab.cpp
index 0d53c3fd9..1d7a9a0c2 100644
--- a/src/slic3r/GUI/Tab.cpp
+++ b/src/slic3r/GUI/Tab.cpp
@@ -751,6 +751,10 @@ void Tab::load_key_value(const std::string& opt_key, const boost::any& value, bo
 
 void Tab::on_value_change(const std::string& opt_key, const boost::any& value)
 {
+	if (wxGetApp().plater() == nullptr) {
+		return;
+	}
+
     const bool is_fff = supports_printer_technology(ptFFF);
     ConfigOptionsGroup* og_freq_chng_params = wxGetApp().sidebar().og_freq_chng_params(is_fff);
     if (opt_key == "fill_density" || opt_key == "pad_enable")