From 751f99a82fb23924afb20fe1bb369517a0d4fd9e Mon Sep 17 00:00:00 2001
From: Anton Evseev <78427278+slayoffer@users.noreply.github.com>
Date: Fri, 30 Jan 2026 18:00:56 +1000
Subject: [PATCH] fix(control-plane): handle undefined response.data in graph
 route (#239)

When the backend graph API returns an error, the SDK sets response.data
to undefined. NextResponse.json(undefined) throws "Value is not JSON
serializable". Check for error/missing data before serializing.
---
 hindsight-control-plane/src/app/api/graph/route.ts | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/hindsight-control-plane/src/app/api/graph/route.ts b/hindsight-control-plane/src/app/api/graph/route.ts
index 077278d4..f93fb605 100644
--- a/hindsight-control-plane/src/app/api/graph/route.ts
+++ b/hindsight-control-plane/src/app/api/graph/route.ts
@@ -24,6 +24,14 @@ export async function GET(request: NextRequest) {
       },
     });
 
+    if (response.error || !response.data) {
+      console.error("Graph API error:", response.error);
+      return NextResponse.json(
+        { error: response.error || "Failed to fetch graph data" },
+        { status: 500 },
+      );
+    }
+
     return NextResponse.json(response.data, { status: 200 });
   } catch (error) {
     console.error("Error fetching graph data:", error);