diff --git a/nextcloud_mcp_server/auth/viz_routes.py b/nextcloud_mcp_server/auth/viz_routes.py
index 56edf48..20ae445 100644
--- a/nextcloud_mcp_server/auth/viz_routes.py
+++ b/nextcloud_mcp_server/auth/viz_routes.py
@@ -212,7 +212,7 @@ async def vector_visualization_search(request: Request) -> JSONResponse:
                     "success": True,
                     "results": [],
                     "coordinates_3d": [],
-                    "query_coords": None,
+                    "query_coords": [],
                     "message": "No results found",
                 }
             )