diff --git a/src/slic3r/GUI/PresetArchiveDatabase.cpp b/src/slic3r/GUI/PresetArchiveDatabase.cpp
index 46d529ca7c..b76d6bc802 100644
--- a/src/slic3r/GUI/PresetArchiveDatabase.cpp
+++ b/src/slic3r/GUI/PresetArchiveDatabase.cpp
@@ -184,7 +184,7 @@ std::string escape_path_by_element(const std::string& path_string)
 
 bool add_authorization_header(Http& http)
 {
-    if (wxApp::GetInstance() == nullptr)
+    if (wxApp::GetInstance() == nullptr || ! GUI::wxGetApp().plater())
         return false;
     const std::string access_token = GUI::wxGetApp().plater()->get_user_account()->get_access_token();
     if (!access_token.empty()) {
diff --git a/src/slic3r/Utils/PresetUpdater.cpp b/src/slic3r/Utils/PresetUpdater.cpp
index fcfc824305..f23ac74b11 100644
--- a/src/slic3r/Utils/PresetUpdater.cpp
+++ b/src/slic3r/Utils/PresetUpdater.cpp
@@ -1186,6 +1186,11 @@ PresetUpdater::UpdateResult PresetUpdater::config_update(const Semver& old_slic3
 			}
 		}
 
+		if (!wxApp::GetInstance() || ! GUI::wxGetApp().plater()) {
+			// The main thread might have start killing the UI.
+			return R_NOOP;
+		}
+
 		// regular update
 		if (params == UpdateParams::SHOW_NOTIFICATION) {
 			p->set_waiting_updates(updates);