From 05dd50afda8c232e39a55b32f9c3dcd810fd1a7f Mon Sep 17 00:00:00 2001
From: BDisp <bd.bdisp@gmail.com>
Date: Thu, 4 Jun 2020 18:48:46 +0100
Subject: [PATCH] Fixed null exception on tabbing. (#615)

---
 Terminal.Gui/Core/Toplevel.cs | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Terminal.Gui/Core/Toplevel.cs b/Terminal.Gui/Core/Toplevel.cs
index 9c85c2681..34aeb4bcd 100644
--- a/Terminal.Gui/Core/Toplevel.cs
+++ b/Terminal.Gui/Core/Toplevel.cs
@@ -179,6 +179,10 @@ namespace Terminal.Gui {
 
 		IEnumerable<View> GetToplevelSubviews (bool isForward)
 		{
+			if (SuperView == null) {
+				return null;
+			}
+
 			HashSet<View> views = new HashSet<View> ();
 
 			foreach (var v in SuperView.Subviews) {
@@ -190,6 +194,10 @@ namespace Terminal.Gui {
 
 		void FocusNearestView (IEnumerable<View> views)
 		{
+			if (views == null) {
+				return;
+			}
+
 			bool found = false;
 
 			foreach (var v in views) {