Fixes editor crash on closing

Fixes editor crash when the gizmo is destroyed and the `SceneTree` is already freed.

1 files changed, 6 insertions, 1 deletions

diff --git a/editor/plugins/node_3d_editor_plugin.cpp b/editor/plugins/node_3d_editor_plugin.cpp
index 4d7be66180..6b909d7ec8 100644
--- a/editor/plugins/node_3d_editor_plugin.cpp
+++ b/editor/plugins/node_3d_editor_plugin.cpp
@@ -4503,7 +4503,12 @@ void _update_all_gizmos(Node *p_node) {
 
 void Node3DEditor::update_all_gizmos(Node *p_node) {
 	if (!p_node) {
-		p_node = SceneTree::get_singleton()->get_root();
+		if (SceneTree::get_singleton()) {
+			p_node = SceneTree::get_singleton()->get_root();
+		} else {
+			// No scene tree, so nothing to update.
+			return;
+		}
 	}
 	_update_all_gizmos(p_node);
 }