From 62c5df36d611aa8f89d1b3599ec356fde2a26c46 Mon Sep 17 00:00:00 2001
From: Gilles De Mey <gilles.de.mey@gmail.com>
Date: Thu, 23 Oct 2025 17:21:13 +0200
Subject: [PATCH] Alerting: Always initialize an empty slice of routes for the
 routingtree (#112880)

---
 .../apps/alerting/notifications/routingtree/conversions.go       | 1 +
 1 file changed, 1 insertion(+)

diff --git a/pkg/registry/apps/alerting/notifications/routingtree/conversions.go b/pkg/registry/apps/alerting/notifications/routingtree/conversions.go
index 70c6ee5ba0d..a200e82e309 100644
--- a/pkg/registry/apps/alerting/notifications/routingtree/conversions.go
+++ b/pkg/registry/apps/alerting/notifications/routingtree/conversions.go
@@ -28,6 +28,7 @@ func ConvertToK8sResource(orgID int64, r definitions.Route, version string, name
 			RepeatInterval: optionalPrometheusDurationToString(r.RepeatInterval),
 			Receiver:       r.Receiver,
 		},
+		Routes: make([]model.RoutingTreeRoute, 0, len(r.Routes)),
 	}
 	for _, route := range r.Routes {
 		if route == nil {