diff --git a/lib/services/api.dart b/lib/services/api.dart
index 67e2a79..b285704 100644
--- a/lib/services/api.dart
+++ b/lib/services/api.dart
@@ -965,7 +965,9 @@ class Api {
     final j = _requireJson(raw, "GetOrderHistory");
 
     if (!_ok(j)) {
-      throw StateError("GetOrderHistory failed: ${_err(j)}");
+      final detail = j["DETAIL"] ?? j["detail"] ?? "";
+      final debugLine = j["DEBUG_LINE"] ?? j["debug_line"] ?? "";
+      throw StateError("GetOrderHistory failed: ${_err(j)} - $detail (line: $debugLine)");
     }
 
     final ordersJson = j["ORDERS"] as List<dynamic>? ?? [];