diff --git a/frontend/scene-generator/llm-client.js b/frontend/scene-generator/llm-client.js
index 48f1914..0750d93 100644
--- a/frontend/scene-generator/llm-client.js
+++ b/frontend/scene-generator/llm-client.js
@@ -316,6 +316,9 @@ function analyzeSceneDeep(sourceDir, dirContents, indexHtmlContent, { apiKey, ba
           result.staticParams = result.staticParams || {};
           result.columnDefs = result.columnDefs || [];
           result.businessLogic = result.businessLogic || {};
+          result.modes = result.modes || [];
+          result.defaultMode = result.defaultMode || (result.modes.length > 0 ? result.modes[0].name : null);
+          result.modeSwitchField = result.modeSwitchField || "period_mode";
 
           resolve(result);
         } catch (err) {