From c99de065f7717e4d7d1182cd3d0a89af389700aa Mon Sep 17 00:00:00 2001
From: Lukas Matena <lukasmatena@seznam.cz>
Date: Thu, 26 May 2022 10:11:49 +0200
Subject: [PATCH] Fix of #8299 (Linux crash when selecting locales)

---
 src/slic3r/GUI/GUI_App.cpp | 20 +++++++++++---------
 1 file changed, 11 insertions(+), 9 deletions(-)

diff --git a/src/slic3r/GUI/GUI_App.cpp b/src/slic3r/GUI/GUI_App.cpp
index 58498f371..7b2611723 100644
--- a/src/slic3r/GUI/GUI_App.cpp
+++ b/src/slic3r/GUI/GUI_App.cpp
@@ -1962,15 +1962,17 @@ static const wxLanguageInfo* linux_get_existing_locale_language(const wxLanguage
                                  }),
                    locales.end());
 
-    // Is there a candidate matching a country code of a system language? Move it to the end,
-    // while maintaining the order of matches, so that the best match ends up at the very end.
-    std::string system_country = "_" + into_u8(system_language->CanonicalName.AfterFirst('_')).substr(0, 2);
-    int cnt = locales.size();
-    for (int i=0; i<cnt; ++i)
-        if (locales[i].find(system_country) != std::string::npos) {
-            locales.emplace_back(std::move(locales[i]));
-            locales[i].clear();
-        }
+    if (system_language) {
+        // Is there a candidate matching a country code of a system language? Move it to the end,
+        // while maintaining the order of matches, so that the best match ends up at the very end.
+        std::string system_country = "_" + into_u8(system_language->CanonicalName.AfterFirst('_')).substr(0, 2);
+        int cnt = locales.size();
+        for (int i=0; i<cnt; ++i)
+            if (locales[i].find(system_country) != std::string::npos) {
+                locales.emplace_back(std::move(locales[i]));
+                locales[i].clear();
+            }
+    }
 
     // Now try them one by one.
     for (auto it = locales.rbegin(); it != locales.rend(); ++ it)