diff --git a/Analyzers/Analyzers/SecureReflection/SecureAssemblyAnalyzer.cs b/Analyzers/Analyzers/SecureReflection/SecureAssemblyAnalyzer.cs
index 61c97ad..ce0bd8d 100644
--- a/Analyzers/Analyzers/SecureReflection/SecureAssemblyAnalyzer.cs
+++ b/Analyzers/Analyzers/SecureReflection/SecureAssemblyAnalyzer.cs
@@ -112,8 +112,12 @@ public static void AnalyzeUsages(SyntaxNodeAnalysisContext context)
         private static void HandleSecureAssemblyDiagnostics(SyntaxNodeAnalysisContext context, InvocationExpressionSyntax invocationExpression)
         {
             var lastArgument = invocationExpression.ArgumentList.Arguments.Last();
+            if (lastArgument is null)
+            {
+                return;
+            }
 
-            var value = context.SemanticModel.GetConstantValue(lastArgument?.Expression);
+            var value = context.SemanticModel.GetConstantValue(lastArgument.Expression);
             if (!value.HasValue)
             {
                 return;