diff --git a/apps/ai-game-creator-shell/src/App.tsx b/apps/ai-game-creator-shell/src/App.tsx
index 5b1c90a4a..fe7993de3 100644
--- a/apps/ai-game-creator-shell/src/App.tsx
+++ b/apps/ai-game-creator-shell/src/App.tsx
@@ -621,7 +621,21 @@ export function App({
       planningSessionToPlanGddState(result.session, result.currentArtifact),
     );
     updateProjectSupervisorRuntime(planningSessionToRuntime(result.session));
-    const sessionError = result.session.lastError?.summary ?? '';
+    const resultError =
+      result.result?.kind === 'error'
+        ? (() => {
+            const payload = result.result.payload;
+            if (
+              payload &&
+              typeof payload === 'object' &&
+              typeof (payload as { summary?: unknown }).summary === 'string'
+            ) {
+              return (payload as { summary: string }).summary.trim();
+            }
+            return '';
+          })()
+        : '';
+    const sessionError = result.session.lastError?.summary ?? resultError;
     setProjectSupervisorRuntimeError(sessionError);
     if (result.conversation) {
       const conversationMessages = planningMessagesToChatMessages(
@@ -632,11 +646,7 @@ export function App({
       savedConversationProjectPathRef.current = localProjectPathRef.current;
       savedConversationCountRef.current = conversationMessages.length;
       latestMessagesRef.current = conversationMessages;
-    } else if (
-      result.result &&
-      result.result.kind !== 'error' &&
-      clientTurnId
-    ) {
+    } else if (result.result && clientTurnId) {
       const displayText = planningResultDisplayText(
         result.result,
         result.currentArtifact,