### Godot version

4.0.2

### System information

Windows 10,Radeon RX 550/550 Series,23.3.2,Vulkan

### Issue description

After Switching to the animations tabs and pressing the key symbol because I wanted to know what it does, Godot crashes

### Steps to reproduce

Go into a project 
Switch to the Animations Tab, make sure no animation is active 
And then press on the key symbol

here is a video demonstrating the bug

https://user-images.githubusercontent.com/59411880/233839816-5489899e-828f-4ac9-9de3-7914f727f754.mp4



### Minimal reproduction project

The File
[package.zip](https://github.com/godotengine/godot/files/11303712/package.zip)

List<BaseButton *> btn_list;
	button_group->get_buttons(&btn_list);
	for (int i = 0; i < btn_list.size(); i++) {
		CheckBox *check = Object::cast_to<CheckBox>(btn_list[i]);
		check->set_icon(get_theme_icon(check->get_text(), SNAME("EditorIcons")));
	}
	label->add_theme_color_override("font_color", get_theme_color(SNAME("warning_color"), SNAME("Editor")));
}
void CanvasItemEditorViewport::_notification(int p_what) {
	switch (p_what) {
		case NOTIFICATION_THEME_CHANGED: {
			_update_theme();
		} break;
		case NOTIFICATION_ENTER_TREE: {
			_update_theme();
			connect("mouse_exited", callable_mp(this, &CanvasItemEditorViewport::_on_mouse_exit));
		} break;
		case NOTIFICATION_EXIT_TREE: {
			disconnect("mouse_exited", callable_mp(this, &CanvasItemEditorViewport::_on_mouse_exit));
		} break;
	}
}
CanvasItemEditorViewport::CanvasItemEditorViewport(CanvasItemEditor *p_canvas_item_editor) {