diff --git a/src/DotVVM.Framework/ViewModel/Serialization/ViewModelSerializationMap.cs b/src/DotVVM.Framework/ViewModel/Serialization/ViewModelSerializationMap.cs
index e004d0a0c1..9ac85da8d0 100644
--- a/src/DotVVM.Framework/ViewModel/Serialization/ViewModelSerializationMap.cs
+++ b/src/DotVVM.Framework/ViewModel/Serialization/ViewModelSerializationMap.cs
@@ -215,7 +215,7 @@ public ReaderDelegate CreateReaderFactory()
             let parameters = method.GetParameters()
             where parameters.Length == 1
             let parameterType = parameters[0].ParameterType
-            where parameterType != typeof(object)
+            where parameterType != typeof(object) && parameterType != typeof(byte[])
             where parameterType != typeof(DateTime) && parameterType != typeof(DateTime?)
             where parameterType != typeof(DateTimeOffset) && parameterType != typeof(DateTimeOffset?)
             select new { key = parameterType, value = method }