diff --git a/src/EntityFrameworkCore.Projectables.Generator/ProjectionExpressionGenerator.cs b/src/EntityFrameworkCore.Projectables.Generator/ProjectionExpressionGenerator.cs
index 7fc3a8f..3eab520 100644
--- a/src/EntityFrameworkCore.Projectables.Generator/ProjectionExpressionGenerator.cs
+++ b/src/EntityFrameworkCore.Projectables.Generator/ProjectionExpressionGenerator.cs
@@ -22,7 +22,7 @@ namespace EntityFrameworkCore.Projectables.Generator
                 return;
             }
 
-            if (receiver.Candidates.Count > 0)
+            if (receiver.Candidates?.Count > 0)
             {
                 var projectables = receiver.Candidates
                     .Select(x => ProjectableInterpreter.GetDescriptor(x, context))
diff --git a/src/EntityFrameworkCore.Projectables.Generator/SyntaxReceiver.cs b/src/EntityFrameworkCore.Projectables.Generator/SyntaxReceiver.cs
index 111dfa0..f205f96 100644
--- a/src/EntityFrameworkCore.Projectables.Generator/SyntaxReceiver.cs
+++ b/src/EntityFrameworkCore.Projectables.Generator/SyntaxReceiver.cs
@@ -10,7 +10,7 @@ namespace EntityFrameworkCore.Projectables.Generator
 {
     public class SyntaxReceiver : ISyntaxReceiver
     {
-        public List<MemberDeclarationSyntax> Candidates { get; } = new List<MemberDeclarationSyntax>();
+        public List<MemberDeclarationSyntax>? Candidates { get; private set; } 
 
         public void OnVisitSyntaxNode(SyntaxNode syntaxNode)
         {
@@ -22,6 +22,11 @@ namespace EntityFrameworkCore.Projectables.Generator
 
                 if (hasProjectableAttribute)
                 {
+                    if (Candidates == null)
+                    {
+                        Candidates = new();
+                    }
+
                     Candidates.Add(memberDeclarationSyntax);
                 }
             }