diff --git a/lib/core/services/api_service.dart b/lib/core/services/api_service.dart
index b38a92f..21cded8 100644
--- a/lib/core/services/api_service.dart
+++ b/lib/core/services/api_service.dart
@@ -3292,6 +3292,11 @@ class ApiService {
       data['parent_id'] = parentMessageId;
     }
 
+    // Always include parent_message as empty object to prevent NoneType error in OWUI 0.6.42+
+    // The server code does: parent_message.get("files", []) which fails if parent_message is None
+    // See: https://github.com/cogwheel0/conduit/issues/311
+    data['parent_message'] = <String, dynamic>{};
+
     // Attach background_tasks if provided
     if (backgroundTasks != null && backgroundTasks.isNotEmpty) {
       data['background_tasks'] = backgroundTasks;
diff --git a/openwebui-src b/openwebui-src
index 6f1486f..d95f533 160000
--- a/openwebui-src
+++ b/openwebui-src
@@ -1 +1 @@
-Subproject commit 6f1486ffd0cb288d0e21f41845361924e0d742b3
+Subproject commit d95f533214e3fe5beb5e41ec1f349940bc4c7043