diff --git a/src/EditorFeatures/CSharpTest/Completion/CompletionProviders/OverrideCompletionProviderTests.cs b/src/EditorFeatures/CSharpTest/Completion/CompletionProviders/OverrideCompletionProviderTests.cs
index 1d98b29d14097..e2dfbc22ef3c7 100644
--- a/src/EditorFeatures/CSharpTest/Completion/CompletionProviders/OverrideCompletionProviderTests.cs
+++ b/src/EditorFeatures/CSharpTest/Completion/CompletionProviders/OverrideCompletionProviderTests.cs
@@ -3508,6 +3508,27 @@ class D : C
                 """, "M()");
         }
 
+        [WpfFact, WorkItem("https://github.com/dotnet/vscode-csharp/issues/6308")]
+        public async Task NoOverrideItemsWhenNotInTypeDeclaration()
+        {
+            await VerifyNoItemsExistAsync("""
+                namespace NS
+                {
+                    override $$
+                }
+                """);
+        }
+
+        [WpfFact, WorkItem("https://github.com/dotnet/vscode-csharp/issues/6308")]
+        public async Task NoOverrideItemsAtTopLevel()
+        {
+            await VerifyNoItemsExistAsync("""
+                System.Console.WriteLine();
+                
+                override $$
+                """);
+        }
+
         private Task VerifyItemExistsAsync(string markup, string expectedItem)
         {
             return VerifyItemExistsAsync(markup, expectedItem, isComplexTextEdit: true);
diff --git a/src/Features/Core/Portable/Completion/Providers/AbstractOverrideCompletionProvider.ItemGetter.cs b/src/Features/Core/Portable/Completion/Providers/AbstractOverrideCompletionProvider.ItemGetter.cs
index 380088f0172ce..2545f398a74da 100644
--- a/src/Features/Core/Portable/Completion/Providers/AbstractOverrideCompletionProvider.ItemGetter.cs
+++ b/src/Features/Core/Portable/Completion/Providers/AbstractOverrideCompletionProvider.ItemGetter.cs
@@ -8,7 +8,6 @@
 using Microsoft.CodeAnalysis.Editing;
 using Microsoft.CodeAnalysis.Shared.Extensions;
 using Microsoft.CodeAnalysis.Text;
-using Roslyn.Utilities;
 
 namespace Microsoft.CodeAnalysis.Completion.Providers
 {
@@ -111,7 +110,11 @@ private bool TryDetermineOverridableMembers(
                 out ImmutableArray<ISymbol> overridableMembers)
             {
                 var containingType = semanticModel.GetEnclosingSymbol<INamedTypeSymbol>(startToken.SpanStart, _cancellationToken);
-                Contract.ThrowIfNull(containingType);
+                if (containingType is null)
+                {
+                    overridableMembers = default;
+                    return false;
+                }
 
                 var result = containingType.GetOverridableMembers(_cancellationToken);