From 8fd0fe3d20714367e766a645264038bf2ea13098 Mon Sep 17 00:00:00 2001
From: BrunoSXS <trustmeiamadeveloper@gmail.com>
Date: Sat, 23 Oct 2021 17:30:18 -0300
Subject: [PATCH] Fixes a game crash caused by instantiating Camera2D and
 sending a notification from it before adding it to the tree.

(cherry picked from commit eb2deabffe7cea3f584ce152781445714cda0ff9)
---
 scene/2d/camera_2d.cpp   | 1 +
 scene/2d/canvas_item.cpp | 1 +
 2 files changed, 2 insertions(+)

diff --git a/scene/2d/camera_2d.cpp b/scene/2d/camera_2d.cpp
index f93b7b0db8a..5425720e103 100644
--- a/scene/2d/camera_2d.cpp
+++ b/scene/2d/camera_2d.cpp
@@ -245,6 +245,7 @@ void Camera2D::_notification(int p_what) {
 
 		} break;
 		case NOTIFICATION_ENTER_TREE: {
+			ERR_FAIL_COND(!is_inside_tree());
 			canvas = get_canvas();
 
 			_setup_viewport();
diff --git a/scene/2d/canvas_item.cpp b/scene/2d/canvas_item.cpp
index cee40af0672..87c7bbca142 100644
--- a/scene/2d/canvas_item.cpp
+++ b/scene/2d/canvas_item.cpp
@@ -554,6 +554,7 @@ void CanvasItem::_exit_canvas() {
 void CanvasItem::_notification(int p_what) {
 	switch (p_what) {
 		case NOTIFICATION_ENTER_TREE: {
+			ERR_FAIL_COND(!is_inside_tree());
 			first_draw = true;
 			if (get_parent()) {
 				CanvasItem *ci = Object::cast_to<CanvasItem>(get_parent());