diff --git a/CliFx.Analyzers/OptionMustBeInsideCommandAnalyzer.cs b/CliFx.Analyzers/OptionMustBeInsideCommandAnalyzer.cs
index 25cebf1..fb1395f 100644
--- a/CliFx.Analyzers/OptionMustBeInsideCommandAnalyzer.cs
+++ b/CliFx.Analyzers/OptionMustBeInsideCommandAnalyzer.cs
@@ -22,6 +22,9 @@ namespace CliFx.Analyzers
             PropertyDeclarationSyntax propertyDeclaration,
             IPropertySymbol property)
         {
+            if (property.ContainingType is null)
+                return;
+
             if (property.ContainingType.IsAbstract)
                 return;
 
diff --git a/CliFx.Analyzers/OptionMustHaveUniqueNameAnalyzer.cs b/CliFx.Analyzers/OptionMustHaveUniqueNameAnalyzer.cs
index 02a5528..e46934c 100644
--- a/CliFx.Analyzers/OptionMustHaveUniqueNameAnalyzer.cs
+++ b/CliFx.Analyzers/OptionMustHaveUniqueNameAnalyzer.cs
@@ -23,6 +23,9 @@ namespace CliFx.Analyzers
             PropertyDeclarationSyntax propertyDeclaration,
             IPropertySymbol property)
         {
+            if (property.ContainingType is null)
+                return;
+
             var option = CommandOptionSymbol.TryResolve(property);
             if (option is null)
                 return;
diff --git a/CliFx.Analyzers/OptionMustHaveUniqueShortNameAnalyzer.cs b/CliFx.Analyzers/OptionMustHaveUniqueShortNameAnalyzer.cs
index 9202c48..b629216 100644
--- a/CliFx.Analyzers/OptionMustHaveUniqueShortNameAnalyzer.cs
+++ b/CliFx.Analyzers/OptionMustHaveUniqueShortNameAnalyzer.cs
@@ -22,6 +22,9 @@ namespace CliFx.Analyzers
             PropertyDeclarationSyntax propertyDeclaration,
             IPropertySymbol property)
         {
+            if (property.ContainingType is null)
+                return;
+
             var option = CommandOptionSymbol.TryResolve(property);
             if (option is null)
                 return;
diff --git a/CliFx.Analyzers/ParameterMustBeInsideCommandAnalyzer.cs b/CliFx.Analyzers/ParameterMustBeInsideCommandAnalyzer.cs
index 3bffa06..ba45b2b 100644
--- a/CliFx.Analyzers/ParameterMustBeInsideCommandAnalyzer.cs
+++ b/CliFx.Analyzers/ParameterMustBeInsideCommandAnalyzer.cs
@@ -22,6 +22,9 @@ namespace CliFx.Analyzers
             PropertyDeclarationSyntax propertyDeclaration,
             IPropertySymbol property)
         {
+            if (property.ContainingType is null)
+                return;
+
             if (property.ContainingType.IsAbstract)
                 return;
 
diff --git a/CliFx.Analyzers/ParameterMustBeLastIfNonScalarAnalyzer.cs b/CliFx.Analyzers/ParameterMustBeLastIfNonScalarAnalyzer.cs
index 5cf3a25..36186ca 100644
--- a/CliFx.Analyzers/ParameterMustBeLastIfNonScalarAnalyzer.cs
+++ b/CliFx.Analyzers/ParameterMustBeLastIfNonScalarAnalyzer.cs
@@ -29,6 +29,9 @@ namespace CliFx.Analyzers
             PropertyDeclarationSyntax propertyDeclaration,
             IPropertySymbol property)
         {
+            if (property.ContainingType is null)
+                return;
+
             if (IsScalar(property.Type))
                 return;
 
diff --git a/CliFx.Analyzers/ParameterMustBeSingleIfNonScalarAnalyzer.cs b/CliFx.Analyzers/ParameterMustBeSingleIfNonScalarAnalyzer.cs
index 62881bf..704d278 100644
--- a/CliFx.Analyzers/ParameterMustBeSingleIfNonScalarAnalyzer.cs
+++ b/CliFx.Analyzers/ParameterMustBeSingleIfNonScalarAnalyzer.cs
@@ -29,6 +29,9 @@ namespace CliFx.Analyzers
             PropertyDeclarationSyntax propertyDeclaration,
             IPropertySymbol property)
         {
+            if (property.ContainingType is null)
+                return;
+
             if (!CommandParameterSymbol.IsParameterProperty(property))
                 return;
 
diff --git a/CliFx.Analyzers/ParameterMustHaveUniqueNameAnalyzer.cs b/CliFx.Analyzers/ParameterMustHaveUniqueNameAnalyzer.cs
index 6ab1d16..83d0bf3 100644
--- a/CliFx.Analyzers/ParameterMustHaveUniqueNameAnalyzer.cs
+++ b/CliFx.Analyzers/ParameterMustHaveUniqueNameAnalyzer.cs
@@ -23,6 +23,9 @@ namespace CliFx.Analyzers
             PropertyDeclarationSyntax propertyDeclaration,
             IPropertySymbol property)
         {
+            if (property.ContainingType is null)
+                return;
+
             var parameter = CommandParameterSymbol.TryResolve(property);
             if (parameter is null)
                 return;
diff --git a/CliFx.Analyzers/ParameterMustHaveUniqueOrderAnalyzer.cs b/CliFx.Analyzers/ParameterMustHaveUniqueOrderAnalyzer.cs
index 38b6076..fa41b52 100644
--- a/CliFx.Analyzers/ParameterMustHaveUniqueOrderAnalyzer.cs
+++ b/CliFx.Analyzers/ParameterMustHaveUniqueOrderAnalyzer.cs
@@ -22,6 +22,9 @@ namespace CliFx.Analyzers
             PropertyDeclarationSyntax propertyDeclaration,
             IPropertySymbol property)
         {
+            if (property.ContainingType is null)
+                return;
+
             var parameter = CommandParameterSymbol.TryResolve(property);
             if (parameter is null)
                 return;
diff --git a/CliFx.Analyzers/SystemConsoleShouldBeAvoidedAnalyzer.cs b/CliFx.Analyzers/SystemConsoleShouldBeAvoidedAnalyzer.cs
index a06aa30..db63900 100644
--- a/CliFx.Analyzers/SystemConsoleShouldBeAvoidedAnalyzer.cs
+++ b/CliFx.Analyzers/SystemConsoleShouldBeAvoidedAnalyzer.cs
@@ -27,9 +27,9 @@ namespace CliFx.Analyzers
 
             while (currentNode is MemberAccessExpressionSyntax memberAccess)
             {
-                var symbol = context.SemanticModel.GetSymbolInfo(memberAccess).Symbol;
+                var member = context.SemanticModel.GetSymbolInfo(memberAccess).Symbol;
 
-                if (symbol is not null && symbol.ContainingType.DisplayNameMatches("System.Console"))
+                if (member?.ContainingType?.DisplayNameMatches("System.Console") == true)
                 {
                     return memberAccess;
                 }
diff --git a/CliFx.Analyzers/Utils/Extensions/RoslynExtensions.cs b/CliFx.Analyzers/Utils/Extensions/RoslynExtensions.cs
index d20809e..92e93f1 100644
--- a/CliFx.Analyzers/Utils/Extensions/RoslynExtensions.cs
+++ b/CliFx.Analyzers/Utils/Extensions/RoslynExtensions.cs
@@ -9,11 +9,16 @@ namespace CliFx.Analyzers.Utils.Extensions
     internal static class RoslynExtensions
     {
         public static bool DisplayNameMatches(this ISymbol symbol, string name) =>
-            string.Equals(symbol.ToDisplayString(), name, StringComparison.Ordinal);
+            string.Equals(
+                // Fully qualified name, without `global::`
+                symbol.ToDisplayString(SymbolDisplayFormat.CSharpErrorMessageFormat),
+                name,
+                StringComparison.Ordinal
+            );
 
         public static void HandleClassDeclaration(
             this AnalysisContext analysisContext,
-            Action<SyntaxNodeAnalysisContext, ClassDeclarationSyntax, ITypeSymbol> handler)
+            Action<SyntaxNodeAnalysisContext, ClassDeclarationSyntax, ITypeSymbol> analyze)
         {
             analysisContext.RegisterSyntaxNodeAction(ctx =>
             {
@@ -24,13 +29,13 @@ namespace CliFx.Analyzers.Utils.Extensions
                 if (type is null)
                     return;
 
-                handler(ctx, classDeclaration, type);
+                analyze(ctx, classDeclaration, type);
             }, SyntaxKind.ClassDeclaration);
         }
 
         public static void HandlePropertyDeclaration(
             this AnalysisContext analysisContext,
-            Action<SyntaxNodeAnalysisContext, PropertyDeclarationSyntax, IPropertySymbol> handler)
+            Action<SyntaxNodeAnalysisContext, PropertyDeclarationSyntax, IPropertySymbol> analyze)
         {
             analysisContext.RegisterSyntaxNodeAction(ctx =>
             {
@@ -41,7 +46,7 @@ namespace CliFx.Analyzers.Utils.Extensions
                 if (property is null)
                     return;
 
-                handler(ctx, propertyDeclaration, property);
+                analyze(ctx, propertyDeclaration, property);
             }, SyntaxKind.PropertyDeclaration);
         }
     }