From 2df0fb1a51fe189b00f527c55d79473bf6813612 Mon Sep 17 00:00:00 2001
From: Jeffrey Stedfast <jestedfa@microsoft.com>
Date: Wed, 20 Nov 2019 14:21:21 -0500
Subject: [PATCH] [Debugger] Don't evaluate null expressions in the tooltip
 logic

Fixes https://devdiv.visualstudio.com/DevDiv/_workitems/edit/1020556
---
 .../QuickInfo/DebuggerQuickInfoSource.cs                        | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/main/src/addins/MonoDevelop.Debugger/MonoDevelop.Debugger.VSTextView/QuickInfo/DebuggerQuickInfoSource.cs b/main/src/addins/MonoDevelop.Debugger/MonoDevelop.Debugger.VSTextView/QuickInfo/DebuggerQuickInfoSource.cs
index a75f91f7aaf..8835fe7e304 100644
--- a/main/src/addins/MonoDevelop.Debugger/MonoDevelop.Debugger.VSTextView/QuickInfo/DebuggerQuickInfoSource.cs
+++ b/main/src/addins/MonoDevelop.Debugger/MonoDevelop.Debugger.VSTextView/QuickInfo/DebuggerQuickInfoSource.cs
@@ -110,7 +110,7 @@ public async Task<QuickInfoItem> GetQuickInfoItemAsync (IAsyncQuickInfoSession s
 					debugInfo = await debugInfoProvider.Value.GetDebugInfoAsync (point, cancellationToken);
 				}
 
-				if (!debugInfo.IsDefault) {
+				if (!debugInfo.IsDefault && debugInfo.Text != null) {
 					await EvaluateAndShowTooltipAsync (session, view, point, debugInfo, cancellationToken);
 					return null;
 				}