diff --git a/src/EntityGraphQL/Compiler/Util/ArgumentUtil.cs b/src/EntityGraphQL/Compiler/Util/ArgumentUtil.cs
index 057221e0..586dd6e5 100644
--- a/src/EntityGraphQL/Compiler/Util/ArgumentUtil.cs
+++ b/src/EntityGraphQL/Compiler/Util/ArgumentUtil.cs
@@ -22,6 +22,11 @@ public static class ArgumentUtil
         List<string> validationErrors
     )
     {
+        if (argumentsType == null)
+        {
+            return new();
+        }
+        
         // get the values for the argument anonymous type object constructor
         var values = new Dictionary<string, object?>(StringComparer.OrdinalIgnoreCase);