From 5c25497aa239a0ffa8f367327f124871b001384b Mon Sep 17 00:00:00 2001
From: Robin Arys <robin@blueoniongames.com>
Date: Sat, 23 Oct 2021 10:38:52 +0200
Subject: Fix possible crash when calling Tree.notification from _ready

---
 scene/gui/tree.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/scene/gui/tree.cpp b/scene/gui/tree.cpp
index 3f041bf65a..992d364464 100644
--- a/scene/gui/tree.cpp
+++ b/scene/gui/tree.cpp
@@ -3570,7 +3570,9 @@ int Tree::_get_title_button_height() const {
 
 void Tree::_notification(int p_what) {
 	if (p_what == NOTIFICATION_FOCUS_ENTER) {
-		focus_in_id = get_viewport()->get_processed_events_count();
+		if (get_viewport()) {
+			focus_in_id = get_viewport()->get_processed_events_count();
+		}
 	}
 	if (p_what == NOTIFICATION_MOUSE_EXIT) {
 		if (cache.hover_type != Cache::CLICK_NONE) {
-- 
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