From c3cebbdd3ab986eeb6ed14261e63f57ec00b54f1 Mon Sep 17 00:00:00 2001
From: tznind <tznind@dundee.ac.uk>
Date: Fri, 30 Dec 2022 10:15:00 +0000
Subject: [PATCH] Add additional guards to UnionSelection method

---
 Terminal.Gui/Views/TableView.cs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Terminal.Gui/Views/TableView.cs b/Terminal.Gui/Views/TableView.cs
index 2a4735ceb..5a674f3e7 100644
--- a/Terminal.Gui/Views/TableView.cs
+++ b/Terminal.Gui/Views/TableView.cs
@@ -769,9 +769,11 @@ namespace Terminal.Gui {
 		/// <param name="row"></param>
 		private void UnionSelection (int col, int row)
 		{
-			if(!MultiSelect) {
+			if (!MultiSelect || TableIsNullOrInvisible()) {
 				return;
 			}
+			
+			EnsureValidSelection ();
 
 			var oldColumn = SelectedColumn;
 			var oldRow = SelectedRow;