diff --git a/DigitalData.Core.DTO/DTOExtensions.cs b/DigitalData.Core.DTO/DTOExtensions.cs
index c5bee5c..827e89e 100644
--- a/DigitalData.Core.DTO/DTOExtensions.cs
+++ b/DigitalData.Core.DTO/DTOExtensions.cs
@@ -9,28 +9,36 @@ namespace DigitalData.Core.DTO
     public static class DTOExtensions
     {
         /// <summary>
-        /// Adds a single message to the result.
+        /// Adds a single message to the result, if not null.
         /// </summary>
         /// <typeparam name="T">The type of the result.</typeparam>
         /// <param name="result">The result to add the message to.</param>
         /// <param name="message">The message to add.</param>
         /// <returns>The updated result.</returns>
-        public static T Message<T>(this T result, string message) where T : Result
+        public static T Message<T>(this T result, string? message) where T : Result
         {
-            result.Messages.Add(message);
+            if(message is not null)
+                result.Messages.Add(message);
             return result;
         }
 
+        internal static IEnumerable<T> FilterNull<T>(this IEnumerable<T?> list)
+        {
+            foreach (var item in list)
+                if(item is not null)
+                    yield return item;
+        }
+
         /// <summary>
-        /// Adds multiple messages to the result.
+        /// Adds multiple messages to the result, after removing nulls.
         /// </summary>
         /// <typeparam name="T">The type of the result.</typeparam>
         /// <param name="result">The result to add the messages to.</param>
         /// <param name="messages">The messages to add.</param>
         /// <returns>The updated result.</returns>
-        public static T Message<T>(this T result, params string[] messages) where T : Result
+        public static T Message<T>(this T result, params string?[] messages) where T : Result
         {
-            result.Messages.AddRange(messages);
+            result.Messages.AddRange(messages.FilterNull());
             return result;
         }
 
@@ -41,9 +49,9 @@ namespace DigitalData.Core.DTO
         /// <param name="result">The result to add the messages to.</param>
         /// <param name="messages">The collection of messages to add.</param>
         /// <returns>The updated result.</returns>
-        public static T Message<T>(this T result, IEnumerable<string> messages) where T : Result
+        public static T Message<T>(this T result, IEnumerable<string?> messages) where T : Result
         {
-            result.Messages.AddRange(messages);
+            result.Messages.AddRange(messages.FilterNull());
             return result;
         }
 
@@ -101,13 +109,13 @@ namespace DigitalData.Core.DTO
         /// <param name="flag">The flag associated with the notice.</param>
         /// <param name="messages">The messages to add to the notice.</param>
         /// <returns>The updated result.</returns>
-        public static T Notice<T>(this T result, LogLevel level, Enum flag, params string[] messages) where T : Result
+        public static T Notice<T>(this T result, LogLevel level, Enum flag, params string?[] messages) where T : Result
         {
             result.Notices.Add(new Notice()
             {
                 Flag = flag,
                 Level = level,
-                Messages = messages.ToList()
+                Messages = messages.FilterNull().ToList()
             });
             return result;
         }
@@ -126,7 +134,7 @@ namespace DigitalData.Core.DTO
             {
                 Flag = null,
                 Level = level,
-                Messages = messages.ToList()
+                Messages = messages.FilterNull().ToList()
             });
             return result;
         }