diff --git a/SabreTools.Core/Filter/FilterRunner.cs b/SabreTools.Core/Filter/FilterRunner.cs
index aa1c5c66..de856995 100644
--- a/SabreTools.Core/Filter/FilterRunner.cs
+++ b/SabreTools.Core/Filter/FilterRunner.cs
@@ -13,21 +13,15 @@ namespace SabreTools.Core.Filter
         /// <summary>
         /// Set of filters to be run against an object
         /// </summary>
-        public FilterObject[] Filters { get; }
+        public readonly FilterObject[] Filters;
 
-        public FilterRunner(FilterObject[]? filters)
+        public FilterRunner(FilterObject[] filters)
         {
-            if (filters == null)
-                throw new ArgumentNullException(nameof(filters));
-
             Filters = filters;
         }
 
-        public FilterRunner(string[]? filterStrings)
+        public FilterRunner(string[] filterStrings)
         {
-            if (filterStrings == null)
-                throw new ArgumentNullException(nameof(filterStrings));
-
             var filters = new List<FilterObject>();
             foreach (string filterString in filterStrings)
             {
diff --git a/SabreTools.Test/Filter/PopulationTests.cs b/SabreTools.Test/Filter/PopulationTests.cs
index b1c5ef54..1a4aea5a 100644
--- a/SabreTools.Test/Filter/PopulationTests.cs
+++ b/SabreTools.Test/Filter/PopulationTests.cs
@@ -6,16 +6,6 @@ namespace SabreTools.Test.Filter
 {
     public class PopulationTests
     {
-        [Fact]
-        public void PopulateFilterRunnerNullListTest()
-        {
-            // Setup the list
-            string[]? filters = null;
-
-            // Setup the filter
-            Assert.Throws<ArgumentNullException>(() => new FilterRunner(filters));
-        }
-
         [Fact]
         public void PopulateFilterRunnerEmptyListTest()
         {