diff --git a/src/openrct2-ui/windows/EditorObjectSelection.cpp b/src/openrct2-ui/windows/EditorObjectSelection.cpp
index 2cda11bd12..3f06c203e2 100644
--- a/src/openrct2-ui/windows/EditorObjectSelection.cpp
+++ b/src/openrct2-ui/windows/EditorObjectSelection.cpp
@@ -1090,7 +1090,7 @@ static void window_editor_object_selection_paint(rct_window* w, rct_drawpixelinf
     y += 12;
 
     // Draw object source
-    stringId = object_manager_get_source_game_string(listItem->repositoryItem->Sources[0]);
+    stringId = object_manager_get_source_game_string(listItem->repositoryItem->GetFirstSourceGame());
     gfx_draw_string_right(dpi, stringId, nullptr, COLOUR_WHITE, w->x + w->width - 5, y);
     y += 12;
 
diff --git a/src/openrct2/object/BannerObject.cpp b/src/openrct2/object/BannerObject.cpp
index 5db9948819..a10e1c6a70 100644
--- a/src/openrct2/object/BannerObject.cpp
+++ b/src/openrct2/object/BannerObject.cpp
@@ -47,7 +47,7 @@ void BannerObject::ReadLegacy(IReadObjectContext* context, IStream* stream)
     auto item = objectRepository.FindObject(identifier);
     if (item != nullptr)
     {
-        auto sourceGame = item->Sources[0];
+        auto sourceGame = item->GetFirstSourceGame();
         if (sourceGame == OBJECT_SOURCE_WACKY_WORLDS
             || sourceGame == OBJECT_SOURCE_TIME_TWISTER
             || sourceGame == OBJECT_SOURCE_CUSTOM)
diff --git a/src/openrct2/object/FootpathItemObject.cpp b/src/openrct2/object/FootpathItemObject.cpp
index 8274735fa4..96809bf306 100644
--- a/src/openrct2/object/FootpathItemObject.cpp
+++ b/src/openrct2/object/FootpathItemObject.cpp
@@ -51,7 +51,7 @@ void FootpathItemObject::ReadLegacy(IReadObjectContext* context, IStream* stream
     auto item = objectRepository.FindObject(identifier);
     if (item != nullptr)
     {
-        auto sourceGame = item->Sources[0];
+        auto sourceGame = item->GetFirstSourceGame();
         if (sourceGame == OBJECT_SOURCE_WACKY_WORLDS || sourceGame == OBJECT_SOURCE_TIME_TWISTER
             || sourceGame == OBJECT_SOURCE_CUSTOM)
         {
diff --git a/src/openrct2/object/ObjectRepository.h b/src/openrct2/object/ObjectRepository.h
index 5317c43da6..f358995568 100644
--- a/src/openrct2/object/ObjectRepository.h
+++ b/src/openrct2/object/ObjectRepository.h
@@ -49,6 +49,14 @@ struct ObjectRepositoryItem
     {
         std::vector<rct_object_entry> Entries;
     } SceneryGroupInfo;
+
+    OBJECT_SOURCE_GAME GetFirstSourceGame() const
+    {
+        if (Sources.empty())
+            return OBJECT_SOURCE_CUSTOM;
+        else
+            return (OBJECT_SOURCE_GAME)Sources[0];
+    }
 };
 
 interface IObjectRepository