From abec183e378ae558a10bf0f54cc865d8313f5672 Mon Sep 17 00:00:00 2001
From: Andrej Ocenas <mr.ocenas@gmail.com>
Date: Thu, 30 Mar 2023 11:33:23 +0200
Subject: [PATCH] Phlare: Fix error when there are no profileTypes to send from
 backend (#65455)

Send empty array if no types
---
 pkg/tsdb/phlare/instance.go | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/pkg/tsdb/phlare/instance.go b/pkg/tsdb/phlare/instance.go
index 5bba4522efb..332873de203 100644
--- a/pkg/tsdb/phlare/instance.go
+++ b/pkg/tsdb/phlare/instance.go
@@ -66,7 +66,13 @@ func (d *PhlareDatasource) callProfileTypes(ctx context.Context, req *backend.Ca
 	if err != nil {
 		return err
 	}
-	data, err := json.Marshal(res.Msg.ProfileTypes)
+	var data []byte
+	if res.Msg.ProfileTypes == nil {
+		// Let's make sure we send at least empty array if we don't have any types
+		data, err = json.Marshal([]*typesv1.ProfileType{})
+	} else {
+		data, err = json.Marshal(res.Msg.ProfileTypes)
+	}
 	if err != nil {
 		return err
 	}