From e40fc57624e0a4fc68829f5837dbc7bf9a3af6ba Mon Sep 17 00:00:00 2001
From: Rikki Gibson <rigibson@microsoft.com>
Date: Sun, 8 Jun 2025 12:43:07 -0700
Subject: [PATCH] call TryGetValue to get dictionary entry

---
 .../SymbolTree/RootSymbolTreeItemSourceProvider.cs           | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/VisualStudio/Core/Impl/SolutionExplorer/SymbolTree/RootSymbolTreeItemSourceProvider.cs b/src/VisualStudio/Core/Impl/SolutionExplorer/SymbolTree/RootSymbolTreeItemSourceProvider.cs
index 2e4bb424200fc..972bab8d8b786 100644
--- a/src/VisualStudio/Core/Impl/SolutionExplorer/SymbolTree/RootSymbolTreeItemSourceProvider.cs
+++ b/src/VisualStudio/Core/Impl/SolutionExplorer/SymbolTree/RootSymbolTreeItemSourceProvider.cs
@@ -116,7 +116,10 @@ private async ValueTask UpdateCollectionSourcesAsync(
         lock (_filePathToCollectionSources)
         {
             foreach (var filePath in updatedFilePaths)
-                sources.AddRange(_filePathToCollectionSources[filePath]);
+            {
+                if (_filePathToCollectionSources.TryGetValue(filePath, out var pathSources))
+                    sources.AddRange(pathSources);
+            }
         }
 
         // Update all the affected documents in parallel.