From ddca43b36b50097146573ca461dbc937c3176dcc Mon Sep 17 00:00:00 2001
From: pomian <13592821+pomianowski@users.noreply.github.com>
Date: Fri, 31 Jan 2025 10:24:29 +0100
Subject: [PATCH] Ignore application assembly when scanning compiled types

#3644
---
 src/Marten/StoreOptions.Registration.cs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/Marten/StoreOptions.Registration.cs b/src/Marten/StoreOptions.Registration.cs
index e412fe96d9..1806b2e6a7 100644
--- a/src/Marten/StoreOptions.Registration.cs
+++ b/src/Marten/StoreOptions.Registration.cs
@@ -135,7 +135,10 @@ public void EventsImplement(Type type)
 
     internal void Scan(StoreOptions options)
     {
-        var assemblies = _assemblies.Union([options.ApplicationAssembly]).ToArray();
+        var assemblies = options.ApplicationAssembly == null
+            ? _assemblies.ToArray()
+            : _assemblies.Union([options.ApplicationAssembly]).ToArray();
+
         var publicTypes =
             TypeRepository.FindTypes(assemblies, TypeClassification.Concretes | TypeClassification.Closed, type => type.IsPublic || type.IsNestedPublic)
                 .ToArray();