diff --git a/ChangeLog.md b/ChangeLog.md
index 0f8f0a1952..f279354439 100644
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Fixed
+
+- Fix analyzer [RCS1246](https://josefpihrt.github.io/docs/roslynator/analyzers/RCS1246) ([PR](https://github.com/dotnet/roslynator/pull/1460))
+
 ## [4.12.2] - 2024-04-23
 
 ### Fixed
diff --git a/src/Common/CSharp/Analysis/UseElementAccessAnalysis.cs b/src/Common/CSharp/Analysis/UseElementAccessAnalysis.cs
index b96ac44334..a8f93f4103 100644
--- a/src/Common/CSharp/Analysis/UseElementAccessAnalysis.cs
+++ b/src/Common/CSharp/Analysis/UseElementAccessAnalysis.cs
@@ -77,6 +77,9 @@ public static bool IsFixableLast(
         if (((CSharpCompilation)semanticModel.Compilation).LanguageVersion < LanguageVersion.CSharp8)
             return false;
 
+        if (semanticModel.Compilation.GetTypeByMetadataName("System.Index") is null)
+            return false;
+
         IMethodSymbol methodSymbol = semanticModel.GetReducedExtensionMethodInfo(invocationInfo.InvocationExpression, cancellationToken).Symbol;
 
         if (methodSymbol is null)